We Tested Gravel Equipment in a Wind Tunnel and the Results Were Surprising
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- Опубликовано: 29 сен 2024
- We took my gavel bike to the wind tunnel and tested a lot of the aero questions that gravel riders have like tires, packs, on bike storage, aero bars and more. The results were genuinely surprising, enjoy!
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Aero socks, check. Funky smooth helmet, check. Top tube bag, frame bag, check. Water bottles everywhere, check. USWE pack, plus a hip bag, check. Didn't register, so no number plate. Being that I only usually pedal at about 50 watts on most rides anyway, I now expect the bike to accelerate on its own because I'm implemented so many watts savings.
Thanks, awesome video.
You sir, are a winner!
After more than one year of riding aero, did the bike manage to pedal an entire season on its own?
Any chance you did a min/max comparison with worst case Unbound setup compared to all of the best case options done at once? I.E.- in the hoods, number plate flat, regular socks, water bottles etc and then in the drops/aero bars with hydro pack, socks etc...
Really informative as usual. Thanks
Please test wheels in the wind tunnel! Are deeper wheels more aero? Or does the wide tire negate the benefits?
Great video.
The only thing ruining gravel are the ever increasing ridiculously high entry fees.
Absolutely. Spending more to race on a dirt road than an entry ticket to Disneyworld isn't normal.
And for what exactly are we paying? People should just start free to join races via facebook and force paid events to ACTUALLY BRING VALUE.
And destroying their equipment on top of that. I'll stick to my local races on hero gravel where I'm not wading through "peanut butter" mud or slashing my tires to shreds.
How much are the fees your paying? Where I am they are between $100 and $150. Local races thou.
@@GravelRacer1 BWR Asheville $225. Local gravel series near me fetching $100+ to race on open plublic roads. Well over a $1 per mile to race my bike, no thanks.
This is the only wind tunnel video I’ve seen that actually answered the questions we all have without marketing BS mixed in.. Awesome work. I would have loved to see the numbers for that skin suit and S-works helmet tho 🤔
BHD approves this comment 😎
Yes, thank goodness we didn't have to hear about "for the win" one time.
when will zipp just go ahead and make a gravel aero disc wheel with like 23mm internal width, optimized for 45mm? BHD demands it...
The only problem is cracked rims from the jumping rocks. Man that would put the warranties to the test.
@@kaseycarpenter73+28mm internal at minimum
Dylan, at which yaw angle have you performed the tests? What I’m after is that when you ride in real life, especially at gravel speeds, your effective wind angle is usually bigger than on tt (due to speed difference). Therefore, some items generating savings like bigger water bottle at 0 yaw might be costing you watts at 5-10degrees of yaw.
I love the scientific approach, great vid as always!
The back hump thing for better aero is a thing outside of cycling too. Motorcycle racers normally have an aero hump on the back of their racing leathers to reduce drag as well.
So true
That hump stems from preventing the riders head and spine smashing backwards in the event of a crash. Aero was an after thought.
@@jimjam218 That's what I thought, but articles suggest its just aero.
@@aaron___6014 Damn. I learned something. I also thought the motorcycle humpback was crash protection.
@@jimjam218 the hump was never intended to be a safety feature. Its pretty soft and actually makes safety worse because the spine cant be straight while laying on the back after a crash.
I gravel race with 28mm slicks treated with flex seal. I am the future.
And a TT bike
@@kevrasx scratch that, naked and flannel/ripped jeans body paint is the future
I know it's not really gravel...but I did BWR with 28mm slicks on a SuperSix Evo.
Sorry, seen plenty of this already.
I sawed this bike in half….
Would be nice to know the error margins for these tests since a lot of the results are in the +-1W range
You'll be hearing from Pete Stetina's lawyer.
This is excellent!! Another contribution to the sport, Dylan. Thank you for your time, effort and focus.
Race promoters needs to actually enforce proper plate placement if the numbers are that crazy. Huge disadvantage to those who follow the rules. Amazing as always, DJ
MidSouth had people walking the starting corral to make sure people 1- had a number at all and 2- had them mounted appropriately.
or just make numbering aero optimized so people won't try to go around it. Whats wrong with putting it on the side, and maybe also having one front of the helmet? Dumb testing human nature
Turns out the old guy with the overstuffed saggy jersey pockets and massive saddlebag is actually more aero
In terms of number plates, gravel organizers should realize it’s not mtb. They should do road style. A number pinned on the back of the jersey and/or a smaller one on the seatpost
I love this video and it’s a great resource. Quick point about aero bars though, anywhere you can use the aero bars you could also be in an aero hoods position so the penalty on those sections would be 10.3W and not the full 41.4W, while the gain from not having them is 4.5W when you don’t use them. This means you would have to use them 44% of the time to see a benefit which you said is not possible . This makes some assumptions about your core strength and wind speed, but aero bars aren’t actually that much faster if you compare them to the best alternative and not the worst.
But you cant hold an aero hoods position for that long. With comfy set up aero bars you will be still quite a lot faster and can relax your hands and butt. This makes quite a difference for many ultra races.
Can't believe nobody has asked... what about shaved legs?? I realize this isn't something you could test, at least more than once. I need convincing!
ruclips.net/video/DZnrE17Jg3I/видео.html Take the Specialized 'win' tunnel with a grain of salt, but still there are savings to be had...
I've been so stoked for this episode after hearing about it on the Marginal Gains podcast where Josh answered my question about potential aero benefits of running a 1x setup vs 2x for unbound.
With and without mud comparisons too.
Thnx Dylan! As always, very thorough and deep data investigation. Can you share your opinion on which power zone calculation approach is more relevant based on FTP test? There are a few system in Trainingpeaks, meanwhile Wahoo makes it their own way, meanwhile Garmin makes it different, meanwhile Strava and Zwift suggest another one etc... And the same situation for the HR zones as well.
Awesome video. For calculating how much time you have to ride in the aerobars, should we be comparing "In Aerobars" to "Aero Hoods", the next best aero position, and likely the position you'll take if you don't have aero bars installed?
So the aero bars gain 6:00-ish minutes (vs aero hoods) and cost 3:20 (while upright). Doesn't that math work out to say you need to spend over 1/3 of the race in aero bars (6*1/3 ~= 3:20*2/3) versus the next best aero position (1/3 of the race in aero hoods position, 2/3 in upright).
Great video Dylan. Many of your savings from the wt are almost identical to my outdoor tests (protocol is 35kmh) which is awesome yet shocking as i wouldn't often trust the wt at these speeds! But good to know! The hoods to drops position at 35kmh is similarly low, 12W for me.
I hope you can next test a full frame bag (for containing an Apidura frame bladder).
Thank you Dylan
You and Silca are a great pairing. Look forward to more!
It's not quite about keeping air attached when we're talking about cyclists, it's simply about filling the void (though attachment has to do with it). You have high pressure up front, and low pressure out the back, drag mostly boils down to that (the pressure differential). So there are two strategies you can use. First is texture so that air sticks to the body longer and creates a smaller low pressure zone behind you (hello aero socks). And second is stuffing. Yes, stuffing. Just put stuff in low pressure areas. It's that simple. Oh and helmets are not individual dependent, they're largely position dependent, people often mix up the two because everyone has a slightly different position (torso angle, head angle, neck angle and shoulder shrug).
The head wind aspect of aero is a good point. I see a lot of people hate on the higher speeds companies quote for aero savings but what you said makes a lot of sense.
Suggestion for next wind tunnel test: Put Backwards Hat Dylan in the wind tunnel and stand back and watch time cease to exist.
I know you had a disclaimer at the beginning of the video expecting you might get some grief for a video like this. But my view is entirely the opposite of that.
Thank you very much for sharing this information especially considering the investment of time and money from both yourself in the companies that are supporting you. Super cool and useful.🤘
I realize you probably didn't do replicate tests, but what sort of standard deviation would you expect for wind tunnel tests? Like less than 1W or several watts? Could some of these small differences just be within the margin of error?
Putting a water bottle in your jersey basically gives your body an aero headtube like shape (elongated). 3.6W is crazy though.
Even though I'm one of these Roadies you speak of I still watch all your vids. Great content and really insightful.
I learn more about road cycling watching this gravel dweeb than I do watching road cycling channels
I’d be interested in seeing results of different aerobar positions. I read one article where the mantis position was significantly faster than the more parallel to the ground position. Also, what are fastest sunglasses, gloves(or not) and also is a front derailleur slowing you down or giving an aero advantage?
A lot of surprising, but perhaps not so surprising results. Glad to hear a top tube bag not only doesn't increases, but decreased drag! The burrito bag makes complete sense and I'll still never understand why many folks in the rando scene still carry large handlebar bags. It's like a 400k ride isn't hard enough they want to make it harder. Great stuff, keep it up.
That was a pretty small bag he tested...make it larger, and at what point does it start being a "fairing" for the rider? I suspect that somewhat larger bags might actually be helpful (too a point...make them too big and too "square" and they could be worse). Not to mention, it's a good place to mount that mandatory number plate, and in a fashion that isn't flat or concave (like how it was shown being tested). It could be that it's the best solution for a front number plate...10W for a burrito bag w/number plate on it is better than 12.5W for the flat number plate ;-)
Jan from Rene Herse had mentioned some wind tunnel data he has that shows the big rando bags do act as a fairing decreasing drag like a motorcycle fairing.
@@JohnMcQueen Yeah...I wouldn't put too much stock in most of his testing. In the broad sense he gets things "right", but some of the details can be a bit stuffed (he doesn't know what he doesn't know about aero testing IMHO). He also made a blog post about how he had some on-ride descent data that indicated a huge rando bar bag on a round tubed bike was faster than an aero bike...but a quick perusal of the Strava file showed the top speeds he was reporting were obvious GPS-speed glitches. Take out the glitches and his rando bag rides had the slowest top speeds on the descents. He was made aware of that, but never corrected the post :-/
@@tanhalt Interesting, thanks for the additional details
That's why my TT bike is going to have a custom seat rail mounted carbon fiber 'tool box' that looks mysteriously like a ducks tail. Great vid.
very like motorcycles tail
@@8paolo96 you got it!
Great vid. I am an aerospace engineer and not much surprises me and frankly delights me! Expect the unexpected in aerodynamics. I am wondering how much effort you would gain closing up the frame entirely. I saw a vid of one of the gravel winners with the top half closed of with some self made plastic housing to contain water and tools and such.
Like fairings?
Do you know if closing up the frame would slow you down when you have side wind?
@@chuckyfox9284 depending on the angle and speed it might even act as a sail and make you faster. but it surely could sway the other way around too.
@@chuckyfox9284 yes, did my usual road group ride on a gravel bike with full frame bag. (more fun riding to and from) No issues with head or tailwind, but in the crosswind sections I struggled. Got dropped (and normally don't) on a crosswind section. The joys of living in the world's third windiest city.
I wonder how well would fare old MTB with 26 inch wheels if you would cover them with discs.
Im curious if a smooth vs knobby 40mm would change the aero drag since even fenders are "more aero" AND how big a difference sock texture can make
The company Swiss Side did test different gravel tire sizes and tire treads in a wind tunnel. A smoother tread is a couple of watts faster than a knobby one. The data can be found on their website
Lots of good info in this video. While it's gravel specific, there's a quite a bit of overlap that can be useful for randoneurring, where rides start at 200km. Slower speeds, more relaxed position, carrying bags and extra water, wider tires, with or without aerobars, etc. Over 200, 300, 400, or 600km, every watt matters. Also, I'd always opt for wider tires. The comfort, control, and puncture resistance gains far outweigh any aero penalty IMHO, especially if it allows you to use aerobars more often.
I am suprised by the difference between a real areo socks and Silca knit aero socks
excellent excellent video @dylanjohnsoncycling. I'm considering many aero upgrades to shorten my time on the 100 mile White Rim trail in a day on a full sun mountain bike. Would the socks, non-sci leg warmers, an aero bottle help in that case?
Money saving tip on aero helmets: Lazer offers an "Aeroshell" for a lot of their helmet models, which is a a plastic shell that clips onto the helmet to cover most of the vents and basically makes it an aero helmet. So for example if you buy the Lazer Strada plus an Aeroshell it's around half the price of the dedicated aero helmet model they offer.
Kabuto has that only on the Aero R1 and R2 if you want other options and it comes with a face shield magnetic clip on.
The Aeroshell is also hot as balls. I use one on my Lazer Z1, but only when it’s cold out!
@@filmaynard Yep winter or TT use
@@filmaynard thanks for the information! I only got mine since fall so I couldn't really test it in hot conditions, but I suspected it might be a little to much for summer
Electric tape for the win.
As much as I appreciate all the Intel, I have even greater appreciation for your willingness to ask the questions that everybody wants the answer to but is afraid to ask. So many channels published drivel as "content" cough..GCN. Thanks! Burrito bag stays home for Unbound 200 this year 😮
Top notch content as always, Dylan. Great partnership with Silca you have!
Another point in favor of running larger tires is if they allow you to spend more time in the aerobars. A favorite of mine are 2.1” thunder Burt’s… they give up nothing on rolling resistance but can float over loose stuff even while in the aerobars!
Very good point. Comfort is so critical to staying on the skis.
You don't get nervous staying on the aerobars over heavy gravel?
A combo of a fairly far back aero bar position (knees end up nearly hitting elbows) to be a bit less front heavy and the big tires really make a surprisingly stable setup. Of course still has its limits but yeah
A combo of a fairly far back aero bar position (knees end up nearly hitting elbows) to be a bit less front heavy and the big tires really make a surprisingly stable setup. Of course still has its limits but yeah
This is basically what Ted King said after winning with a lefty suspension. The fatigue prevention of the suspension allowed him to sit tucked for a great deal more of the race.
Dylan, thank you for an awesome video. Could you please speak a little to the sensitivity of the wind tunnel measurements and calibration which you experienced during your study? How repeatable are the tunnel measurements back to back with everything being kept the same? What is the smallest increment of CdA or the equivalent W that the tunnel could measure? If your testing spanned more than 1 day, can you share your control run results across the testing days?
Ha, I'm a bikepacker, your wiley gravel gains mean nothing to me!
on a serious note though, I'd love it if you guys could get another wind tunnel and test some bikepacking gear for aero, particularly if you could get a full frame bag+hydration hose (ie with an apidura bike-specific bladder), and the Tailfin Aeropack. Given my current bikepacking setup, I estimate I lose 12-20w for my front bag (swift zeitgiest), gain back 5w for the full frame bag, and the tailfin gives me back another 5w, even after loading all the extra crap on the outside. So maybe a net loss of 3-5w?
Not that bikepacking is about speed and time savings, but my recent bikepacking trips are totaling over 150 miles, and being 4-8hr days that's a lot of potential energy savings.
GCN has done videos for different bike pack setups tested in the wind tunnel. Seat Post pack performed the best for aerodynamics. Search their page for ideas.
Great video, Dylan. This will be one of your most-watched videos is my guess.
I think the most interesting test would be non-aero gravel frame with 700X40 tire versus aero gravel frame and the same tire. In other words, do the bigger tires disrupt the airflow so much that the frame shape is largely irrelevant?
Hmmm, maybe sticking a pool noodle down the back of our jerseys will become a thing.
Brilliant, think I'll do that next race!
Wow Bro. If I do all these optimisations, according to my math, I won't have to pedal!!!🤘🧠🧠🧠🧠
ya'll may not like it, but he ain't lyin'.
I appreciate why the delta power between configs is useful, but what did you find your overall CdA to be for the different configs? Lionel Sanders (ironman) recently posted his wind tunnel results and he shared CdA.
12:17 I'm gonna sue this channel for the cost of scraping my brain bits off the wall because that just BLEW MY MIND!
Your tests showed a 1.6w savings for the tall SILCA socks. I noticed there website advertising a 5w-10w savings. Any thoughts on the difference? Thanks -Ryan
The number plate drag numbers aren't surprising, but at the same time are completely meaningless. If the rules for an event call for it to be flat in front (the worst aero position), so what? Every rider in the race faces the exact same penalty, making it no penalty at all.
I'd always been curious about what difference watts made at lower speeds!
Well, you never stop learning. Thanks for this. The hydration pack really surprised me.
One idea for a possible future wind tunnel test would be a full frame bag.
Full frame bag with hydration bladder inside rather than in a backpack.
Great information. Love the SOG-leveling arguments. Thanks again for introducing a smidgen of sanity to all the vibe talk. It's always fascinating to learn there are still people (newbs?) who don't consider their speed while riding down hills as factors in the aero equation. Unbound may be flatter but it still has about 7-8000' elevation throughout the course. Most of the hills can be freewheeled down at 20mph and, if running any mid-section wheels you'll be able to get almost half way up the next one before putting down real power. The only difficult part for us less-powerful riders will be safely navigating all the mid-packers riding their brakes down the hills in search of their next flat. As for aero bars I use them to gain speed in the wind and, almost as importantly, for comfort on long rides; to take pressure off my hands for a spell. And thanks also for the pack numbers. Really. I have five (5!) run-specific hydration packs, three of which are light weight and two are somewhat aero but I'm now considering the Uswe which I've resisted in the past.
Aero hoods position was the most dramatic yet practical gain for most riders. Minimal penalties for wider tires, hydration and frame bags means staying fresh, hydrated and fueled over long rides is the play and suffering needlessly is as misguided and self-defeating as a reasonable person would expect.
Thank you for some great info! But given the goal of finding out what works for unbound 200, shouldn't you have done all the testing with the full flat numberplate?
Preach on the low speed savings!!!!! Savings are savings.
Very well done, Dylan, and consistent in quality with all your other videos. I really like it that you're able to make fun of yourself. Keep it up! It lends credibility to your presentation (and makes it more enjoyable).
Add crank length to your aero testing, you will be in for a surprise.
Can we get race promoters to ditch number plates and use pin on numbers? They serve no purpose other than to try and sell you photos later. We've been racing road for decades with pin on numbers with no issue.
In triathlon we use stickers on seat posts (similar to the pin on numbers) and also on helmets. The promoters can easily sell us photos using these numbers without any aero penalty to the athletes.
for next test try bending the hoods inwards Remco style
What kind of effect do you think rim width has on tire aerodynamics? Would a wheelset like the Nextie AGX45 (29 ID, 40 ED) negate the aero losses with using wider tires?
On rough gravel on a long course - comfort is a huge benefit of wider tires
Finishing faster is typically the most comfortable position.
The point about a 25km/h wind is exactly what needs to be made, people forget ground speed is not airspeed
The lower speed , watts saved, and time, make so much sense 🤯
How do you keep your Rule28 socks from falling down 10min after you start lol
I'm surprised he didn't test full on overshoes - not only more aero overall but also helps if you need to dip in mud or water - mud does not get inside the shoe from the top.
glue
I would loved to see aero bottles tested in the future
Hi Dylan some of us want cda numbers. If you could post a link to those that would be awesome!
At 35 kmh a .001 cda reduction is equal to a .56 wattage reduction ( air density 1.226 kg/m^3)
@@willsitz4901 I understand that. I want to know what Dylan's absolute cda numbers are eg: 0.27 to 0.26 etc.
I'm surprised you didn't test deep section carbon wheels. I've heard from numerous sources, including manufactures that deep section gravel wheels don't make much of a difference. That is for two reasons. First, the air is already turbulent leaving the gravel tire. Second, the ratio of tire width to outer rim width is much wider on a gravel setup therefor the rim isn't affected by the air because of the larger tire.
What about hydration pack under skin suit (either on the back, or on the front as per some time trialists e.g. Andy Schleck/Dan Bigham)?
I am looking forward to see a lot of bikes loaded out like they are going on a 3 week bike-packing trip
Awesome video Dylan! I wouldn't have guessed in a million years that my 3rd water bottle in my jersey pocket is actually making me faster! Also I have to admit I kinda want some Rule 28 socks now 😆
Yeah I guessed it, but the other advantage is it doesn't pick up all that muck from being under the downtube.
@@gregmorrison7320 I put my tool kit in the bottle cage under the downtube in one of those "keg" looking containers. Doesn't matter if it gets all muddy.
Got 2 pair of Rule28 socks and they collect dust because they won’t stay up and actually cause me to lose aero!
Believe it or not, wearing a cape like a superhero actually makes you significantly faster.
Wish has some $3 socks that look almost identical to the Rule28 ones. Would be curious to see if they perform the same in the tunnel.
Dear Dylan. What is the measurement uncertainty in this wind tunnel test? You are quoting numbers down to 0,7 watts which is very very small. Are you perhaps measuring at higher windspeeds and then adjusting to lower speeds? I am skeptical that these values are meaningful at all.
In addition to this, have you taken into account that real wind conditions at low speeds are turbulent, i.e. chaotic, and not at all steady state?
I was wondering the same...would be interesting to know the tolerances/margins of error for these types of wind tunnel measurements.
Great video Dylan! So does this mean you are going to be selling the 47 Pathfinder pros you've been hoarding? I need a few pairs :)
I read somewhere that a baby seat can actually save watts.
Similar to how oscar egg broke the hour records in the 1800s
What were the results with the Rule 28 Road suit?
New it!! About the pack!
Did a 1/2 iron with a pack, got made fun, but had best time recorded to date in that distance.
did you use for both ride and run? Tell us more.....
@@Selfrighteouscyclist it was just for the bike. I am going to try it with the run in Ohio 70.3
Skinsuit makers need to start integrating hydration pack
Just strap it on underneath
I would be interested in seeing you try the Cyclite Aero Handlebar bag which I've heard is more aero than the control.
I just posted a link to the test that included that bag among others. The downside of that bag is ~4l of heavier stuff (ie a bladder) changes the handling. If you keep it light, it works well with aerobars. I suppose you could crank the bag to normal handlebars with voile nanos but I haven’t tested that.
Dylan, in regard to time-limited wind-tunnel access, you might consider Design of Experiments (DOE) testing of multiple factors at a time, at least where you'd expect no interference (like changing wheels and helmets) Caveat: I haven't done wind-tunnel specific research on this.
A few suggestions:
Try transient wind tunnel. Seriously more expensive, but much closer to the real world data, because IRL the wind never attacks a vehicle from a single yaw angle for any prolonged period.
Re tyre sizes: that ideal platform in the tunnel is not the same as gravel in terms of "shakey-shakey", you know. So since bigger tyres at lower pressures are vastly easier on the rider, that would be much less fatigue accumulation over the course of the race. As it has been brilliantly illustrated by Cadex at Ironman, that will allow one to ride faster for longer. You cannot test for stuff like this in the tunnel. Or you have to at least find one of those smart treadmills - you know, those "for the ultimate Strava experience" and plot a long course with constantly adjusting grade, or something. Ideally, you'd glue assorted bits of cable (to simulate roots) and actual gravel to the treadmill belt - to feel those pesky shocks and vibrations.
I did a time trial and they had us pin the numbers on the left rib cage area of our jersey. Myself being smaller couldn't help but notice larger riders have it much easier pinning the number, while maintaining a more flush surface. We should use those programmable LED Lights like you see on bike spokes (or something along those lines).
Real TT riders use 3M Super 77 adhesive and glue the number on ;-)
@@tanhalt is that the stuff Clark Griswold used in Christmas Vacation? :)
I always figured the hydration pack would be faster since it seems like it would act as an aerodynamic fairing. The big surprise for me is that bigger bottles are more aero. I also am surprised that the seat tube bottle is more aero than the downtube bottle.
Yeah that was a good take away with the seat tube bottle although most my rides require more than 1x bottle, perhaps one in the pocket and one in the seat tube cage, guess it is experiencing more disturbed air than when on the down tube.
@@gregmorrison7320 my guess is that it helps the rear tire be more efficient than the downtube bottle helps the front tire... Only thing that makes sense to me anyway.
Now I'm wondering why the pros don't just hang onto an empty bottle in their shirt pocket all the time.
I'm looking forward to seeing if that prototype Silca tail bag is release. It definitely would be a good investment to buy.
These value are for if you ride solo. But you are probably ride partly in the wheels.
Interesting about the bottle in the jersey pocket. It makes sense, but I'm sure it's highly dependent on angle. I hate wearing a hydration vest, and am typically not a fan of carrying a bottle in my jersey, but may be more inclined to do so now...especially with the summer races upon us. I was dropped from the lead group at a water station at a race this year as I wasn't carrying enough water on me (though I found it simultaneously annoying and amusing that they purposely drilled it at that point once they knew I stopped).
Of course the other side of that equation is carrying that extra mass up every single hill on course as well.
Bike number plates are pointless. The numbers change from race to race, so there is no consistency with which athlete they correspond to. And when races are televised they NEVER put the riders number next to their name, so you can't even tell who the rider is from the number anyways. And since no cyclists put their names on their jerseys, it's a guessing game to figure out who is who unless you are extremely familiar with each rider's form. Honestly I think it is a big hinderance to attracting new people to watch the racing.
That was an awesome research! Finally someone addressed the elephant in the room !!!!!!!!!!!!
Excellent job putting all that together. Planning a 200 mi road event in Jul. Thanks man. And thanks Silca. Using some of their stuff.
the socks stay aero with mud on them ?
How many Watts did the loose jersey at the upper back of the shoulders cost? We kept seeing that and were hoping you'd change jerseys and comment on it.
Bravo. As always a brilliant vid backed up with proper science.
I’d be interested in the calculation of time saving given your actual previous speeds with the variations in speed. Since speed to resistance isn’t linear the variations in speed would be significant. I also wonder the effects of riding in a pack or pace-line. Thanks for the video.
I’m curious about the aero drops position- that is drops with bent elbows. Everyone seems to always test straight arm drops to sell more aero bars
What I really want to see in your next test is applying all savings from this video and comparing all the potential saving to the actual savings.