Why BMX Crank Length Matters!
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- Опубликовано: 30 июл 2024
- In today's installment of Tech Thursday brought to you by: Phu Vu (@_EPICBMX) We have: Why BMX Crank Length Matters! In this video we learn the difference between 160mm, 165mm, 170mm, 175mm, and even 180mm cranks. How these length correspond or clash with certain types of riding, rider heights, and frame and foot lengths.
Bike Crank Length Matters!
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The main advantages of short cranks in DH and enduro MTB are that 1) it helps with clearance while trying to pedal through rock gardens, 2) a shorter stance with feet closer together means your legs are a bit straighter and can absorb bumps more easily, 3) you can spin faster when you're turning smaller circles and being gravity assisted means you don't need so much torque.
I went from 160 to 165 recently and the feeling is WAY different. So much smoother of a pedal too.
You riding a 170 now? Is it even smoother? Lol
Lol noob pedo
How long are your legs
Still running my 40 year old 175mm Redline 401 Flight cranks today.
That's a Vernier Caliper. Not a micrometer.
There dial calipers. Vernier Calipers are very similar but do not have a dial indicator
@@tonyconrad2895
The harbor freight caliper he used, that does not have a dial, isn't a vernier caliper because vernier calipers don't have dials... That's what you're saying, correct?
Digital automotive calipers
Those are digital calipers. Dial have a round face and not digital. Vernier have a scaled rule. Machinist of 26 years.
Some parts of the country call calipers micrometers. And they are. To be exact it is a Digital Micrometer Caliper!
Man, I'll do 20 miles on a ride, and since I dont do pegs anymore, I've gotta get away from 170s, get back to 180s like the old days
Dope video, those Primo (Churchill) cranks 🔥🔥🔥I got those in chrome just the other day.
Primo jj pedal review on my page 🤙🏽
The dislikes are the guy Phu karate chopped
Wow! It is actually a great video 😃,
You got a new sub.
Hey bro
4:13 yes you feel the difference i went from 175 to 165 and you feel it, now it feels weird to ride bikes of friends because they al have 175 and it feels like rowing a boat or something
Those are digital dial calipers. Micrometer look more like a small clamp with number scales. Both do same job. Maybe premium would be better than aftermarket. Great vid some info I have never considered.
Now its no Meter LOL. I thought the glass Broke. GOT ME lmao
I've been to all the bmx shops around so cal and the one that knows his shit is phu vu. Epic bmx.....the ones that are giving thumbs down are crappy comments are just haters.if u want your bike done the right way or know the right info trust phu vu he's the only one who gave me the right info about everything! The man knows his shit for real
I have the 160 Odins and love them , they are awesome and my feet do not get in the way while grinding
I need to plan a road trip, just to visit this shop. This shop is now on my bucket list.
Most definitely 🤝
Your bike set up and parts size is all preference what you like and how you want your individual bike to feel you don't need to run whatever size of this or that because someone else dose don't be afraid to experiment and try out new parts or a buddy's bike to see if you like how something feels.
Great info 👍🏼
These are my favorite kind of videos
I used 185mm with a 44T upfront and 14T in the rear when I raced, that would give you more top end speed down the straight.
And zero torque off the gate, especially in a short track lol. And the launch is 9/10 of the race. You would be struggling off the line big time with that gearing on a shorter track. You would never top out in time for the first berm. You must have been on a LONG track bud. Biggest I ever raced with was a 46/16. And even on longer tracks that was enough. Your gearing is 62.8 gear inches. 46/16 is 57.5. 44/16 is 55. Like I said, you must have been on a hella long ass track. Cause on the tighter berms , I'd spin over you with my 175s with 46/16, while you are "choppin wood" with 185s with 44/14. With my "smaller" gearing, I'd be running around you. You may have an advantage on the straights if they are long enough. You must have a long leg inseam as well to run 185s. I was choppin wood all day with 185s, even with smaller gearing. No offence. Bitd longer cranks meant better speed, ya top end, but not lower. Longer isn't necessarily better when it comes to cranks. You wanna spin not chop bud.
@@davidmaerz2756 LOL 😆 Learn how to time a gate drop bro, then you can jump the gate legally and you'll get better starts ...
@@hollywoodplumbkra8zysrt some tracks get pissy at the legal gate jumps. Good plan though. Never understood the light gearing on race bikes.
Crazy how in cycling even a 10mm difference it feels/rides different
10mm makes super different
Great explanations. It is always nice to listen to Phu talking about specs.
Very educational
The trials folks often use cranks as short as 155mm. For my bikes I find 165 /167.5 mm to be near Ideal for me ( 5'4" ) when our kids were little my husband used shorter cranks on the bmx bikes, they did well and as the kids grew up they then used the 170's / 172.5mm length. Being able to pefay through the corner is a huge help......
My cranks are 88mm. Good for rock clearance.
Here's a question for Phu.
How come are we still using the Top tube length based on the "distance of the head tube and the seat tube" if head tube/seat tube angle differ in different bikes. A little bump in an angle will greatly affect the distance. Also, since we are at it, lower stand over will also result in a "shorter" top tube as a taller stand over will result in a "longer" one.
Just curious as i'm amazed on how little tweaks on frame geo greatly affects ones riding.
Phu dropping knowledge!
He's very knowledgeable and in depth
Alfredo i have a good question in my opinion for the channel, Do you mind talking about the different levels of bikes in a way that explains what each different level of bike abuse each can handle, how much more can a 100%chromo frame withstand or last than a steel frame, what wheels absorb the most impact for flatland, can a $500 Cult “pro complete” bike be better than a $1000+ signature bike Sunday bike
I dig it! Will pass this idea along to Phu!
@joel blanco just in case you didn't know "chromo" is Steel bro, just a better grade of steel. The cheap frames and components are usually awful High Tensile (HI-Ten) steel that is usually heavier and yet weaker.
@@OLI-vx1md yeah haha im just a casual bmx’er, i ride atvs and dirtbikes, so to say the least, i just ride my sunday bmx bike for fun but my race motors for speed, the fastest ive gone on my bmx bike was 35-40mph downhill
Its a vernier caliper not micrometer. Anyway, what pros or cons does one spindle diameter have over another?
I run Profile Racing 3 piece in 160mm, it’s on a dirt jumper so I’m not worried about leverage or speed. I ABSOLUTELY LOVE my cranks too, like hands down my favorite part I’ve bought (close second is my Cult Dak guard sprocket) But what I’ve noticed is it’s easier to spin, and I feel more nimble lol n the bike. Plus you can’t hate on classic Profile cranks!!
Lol noob
When you're at the track, you're locked into the pedals and putting pressure into the gate to stay upright. When the gate drops you have to get to speed from a standstill and sometimes you choose to pull up a bit because your flat to balance. So, the longer your cranks your can get the speed faster because the downhill isn't that long before hitting the first jump. Gearing is also different I think, if you're running a 44/14 or 15 you wanna crank them things.
What’s your opinion on 44/20
With some mountain bike cranks
@@thehomiejuan1306 slow AF
First of all, not a micrometer, that’s just a digital caliper, second, as a fat old guy who hasn’t rode a bike in five years, I 1000%support going to shorter cranks for my knees sake, my crap ass stock cranks are 175s, I recently bought the fit blunt 160s, there is a night and day difference in comfort. If I could find some adult strength 150s I would totally buy them. And it makes sense, take your feet and stand with them comfortably in a normal bike position, or even just take a normal length step, when you look at it it’s not like a running stride where it’s a long distance, it’s probably less than 30 inches, when we’re talking about a small distance like that taking 15 mm off each arm is 30 mm off your entire step, and comparatively speaking we’re talking about 5 to 10% of a change which is huge it just doesn’t seem like it because we’re talking about such a small number
Get into a bind and this thing is a life saver
Do a video on brake adjustments 👍
On some 26' dirt jump frames 170 or 175 can also be too long for doing barspins because of the front foot blocking the rotation.
On downhill bikes they use 165 to reduce the chance of hitting a rock or root with your crank/pedal when going at high speeds to prevent going over the bars
-> shorter cranks=less material sticking out=more ground clearance
I gotta try this for my trail BMX. I currently run 170mm.
One more point worth mentioning would be the clearance between your front foot and the tyre. Especially during barspins.
Very solid point!
I wear a size 14/15 sneaker. I occasionally will hit my heel on my rear peg because of the shorter chain stay, plus my big foot.
I just got cult devo with 21” TT. How if i put crank 160mm, that gonna be alright, i want tO change bcoz My tall 163cm,
Thanks bro,, 🙏🏼
Great from Indonesia
Alfredo
You gotta do a tutorial on vader slides or vader jams. Such a sick trick but not much good tutorials for it. We need a in depth version
"Aftermarket" means it's not an OEM part. BMX companies really should be using "Custom" or "Pro" for their higher end parts but it seems those two words have already been overused in the industry. Phu's just repeating what the manufacturer's are stating so he's not wrong.
Epic Bmx is my go to spot 🤙
Your right on the money!
this BMX shop is a paradise to me 😍
For real
For real
Im a shorty, 175mm is too big for me and it makes it hard to do the backwards movement on a cassete hub so I figured out a 165mm could be my perfect size, I bought 170mm cranks to try and see if they are more confortable or if they still feel too long for mw
What was your conclusion?
I feel I have more leverage to bunnyhop higher when I ride a longer frame and longer cranks. I would love to hear Phu and Fredo's thoughts on this, Max and Ethan too.
I'm midschool old and got back into street. Bought a Hoder frame and 165 cranks (super light), but couldn't jump high like I used to. Then went up to 170, felt a little better. Just got a longer frame (CULT Walsh) and 175's and it just feels right, I think my feet spaced farther helps with leveraging the backend to snap up. And the longer frame helps to lift up higher and I don't feel like I'm gonna loop out. It's probably different with younger riders since they're used to shorter frames/cranks. I just feel like I'm working harder to bunnyhop on a short frame/cranks.
Same, longer cranks gives me more leverage.
That’s interesting, because it’s been said that shorter cranks will let you bunnyhop higher. Try jumping with one foot in front of the other, (without a bike) and the closer together your feet are, the higher you can spring. But maybe it’s different for different people.
It's probably just the cranks. Shorter rear end would be easier to scoop up faster. Albeit you need to balance it out cause you can only hop as high as you can get your bars up along with that initial pop.
So however high the bars go(which rear end can affect) and then how many inches of vertical pop you get. Perfect scoop and tuck and you get your wheels leveled out maybe rear a bit higher. Too short on the rear end and ir gets hard to pull up as high.
@AndrewBMX there's a trade off. In theory longer crank arms can help with leveraging the rear up. But can hurt you ability to pop vertically before the tuck and scoop.
So there's like a sweet spot. Or run a brake and cheat if you run a cassette hub. Although in theory you can hurt your ability to hop and do tricks if you get yourself into bad habits with it.
So excite
I've used both 180 and 165 only on extreme tracks and places that have distances between jumps
Is there a relationship between crank length and tire size? As it pertains to bmx racing: cruisers, dirt jumpers w/26” wheels
There’s no direct correlation we can think of
Crank length, sprocket teeth number, and tire size all have an effect altogether.
Foo hair so slick he cranked this vid out with the quickness
you caught that!
Man…been watching steadily for a min and comment when I can…if you know you know
I had a problems back in the day with 175mm doing bar spins off jumps tire would hit the tip of my shoe. I also rode left foot forward and grind on my right side. Maybe that was the problem? Lol I dunno
What about 165 though for someone that likes to ride street park and trail? Is that still a recommendation you would make
Thank you .i am french and i don't speak engligh but i leasten and yours explications are very good
Brett Banasiewicz was running 170mm on the front and 165mm on the back to help with whips
Aftermarket parts are parts not readily found on stock models from the factory.
I’ve been on 175mm cranks for over 10years now purely out of a habit i guess(just buying 175mm as a default because i that’s what i always rode), i ride a modern frame now with 12.9 backend and 4pegs, i never had an issue with my heels hitting the pegs(but I know it’s a pretty common issue). I’m super curious how shorter cranks feel just because of this video tho.
175 for speed, 165 for freestyle tricks. 170 for a happy medium. 160 for flatland
Let’s go he back
Tell Brandonand dem to come back to vloggin bro fr
Gosh I need that primo biscuit seat in tan sooooo bad.
Gotta question I'm 5'8 should I get a 24inch bmx I'm just gonna be cruising jumping curbes stuff like nothing major someone one told me like 24 or 26 so is that a good bike size for me
24" is perfect. 26" is literally for cruising, but if you want that traditional 20" style, get a 22".
Also i weigh about 190
@@stebensbobby if you want to do minimal stuff, get the 24". If you simply want to ride sitting down and pedal, get the 26" or 29".
Yes I'm riding 152yo cranks and it's smooth pedaling but I want to no we're I can find this brand of cranks the to brand coz my left side arm pinch bolt broke so please help
Hardware store...if it's just a bolt,
They come in differrent ratings for tensile strength
Long cranks are less tiring to pedal with because there is more leverage every pedal stroke so more power is put into every crank so you need to pedal less
...And in pretty much any cycling discipline other than freestyle bmx and downhill Mtb, I’m pretty sure crank length should be determined by the length of the rider’s femur (knee directly above the pedal;seated)
160mm on Enduro MTB for a more balanced and smooth snappy crank feel. 180mm on BMX for larger stance for locked in feel and long crank stroke. 6ft tall L/XL MTB, 20.75” BMX. +10mm has a noticeable feel in my experience. Confidence in your stance is confidence in your performance
Now someone try to explain the 4 foot wide handlebar trend. 😆
i've noticed that frames from WTP rear end are getting shorter that some riders are going down to 160 cranks.
also, that their new frames have higher head tube height that they are going back to frontload to compensate for that rise in head tube.
one reason that i can't switch to a WTP frame because i've slammed and cut my steerer tube already and just bought a new bar and stem. switching to a WTP frame will mess up my current preferred front geometry. that will force me to buy a new fork, and either a new bar or a new stem or both.
Fit shortcut frame features a 12.4 back end. Straight fuckery. I thought my og wifi with a 13.1 was short in its day
@@RoachDogggJR yeah. Shortcut kept it pushing shorter. Just wondering how short they are going to push it even more.
If i remember right, when fly tiera came out, everybody thought it was too short. Now look where were at now.
You told me to unsubscribe so I subscribed. Fight the system!!! Thanks for the great vids
👍🏻👍🏻
My personal opinion about the cranks.
There is a difference between 175 and 165mm cranks. The shorter your cranks are the higher ur stance will be on the bike and with longer cranks the lower your stance will be. It's definitely easier to pinch the seat with shorter cranks and it helps with clearing the back peg when doing manuals and fakie manuals.
How when stance is measured while cranks are level?
Size always matters!
No it’s the Motion in the ocean😂
I'm more like motion with lotion lol
😂😂
Both of you are right
Pause
What do you think about 180 on a 26 inch cruiser?
Normal
The measuring tool is called a caliper. Like the calipers on disc brakes. Micrometers use a spindle with a thumb screw to measure. Calipers slide.
Phu, by the looks of your shop, it appears you are the only shop that does not have any shortage. By the way, do you sell online?
Could i run 160 on a 29er bike
Calipers are the name of that measuring tool. Longer crank arms equal more torque to get up to speed faster.
WHERE IS THE SHOP AT STOLEN PART
.
?
The measuring tool is called a vernier or calliper lol x
Phu, you da man
I have 180 mm arms on my 02 Dave sig flair , super fast 💨
125 mm on my Flatland. Big feet plus short back end requires short cranks
How to I order parts from you. What's your web page thx
I got big ass feet and my first fully built bike, I didn’t account for crank size. So I couldn’t ride 4 pegs. My foot kept hitting the back left peg.
Do a review on forks
U said if it's not a micrometer what is it? It is call a digital caliper. They also make dial calipers!
Yeah.
👊🏻👊🏻
Not sure if you guys covered this but curious to hear about gearing ratios and what would be ideal for certain types of rides. Does wheel size and crank size matter when deciding what size sprocket / chainring vs freewheel / cassette to get?
Depends on frame geometry, but its easier to touch your toe to the ground on a 180mm… not usually a good thing and particularly not a good thing when you are doing 55 mph. If scars could talk.
Haha good points!
Intresting 🧐
🤓🤓
I wanna do wheelies and jumps what shoul I get
A Subrosa BMX bike
🔥🔥
🙏🏻🙏🏻
is the tune in the back round iphone alarm ??????? lol
Short cranks help my knees and back. Can't run long cranks and tall gears anymore, knees get blown out just riding to the spot.
I am 6'02" and I love 175s and 180s.
That device is a digital caliper.
for racing the cranks go by the riders inseam
I’ve never tried anything below 170 in my life and all the cranks I’ve ever had have been 175 just because that’s what I’ve got. Right now I’m running $15 used thunderbolts lmao 😂 I just don’t see the point of spending $300 to shorten my cranks by 20mm. Also, I have a 2021 bsd alvx frame and my 175 cranks don’t hit the frame at all that’s total bs.
Lol they aren’t saying the cranks are gonna hit, they are saying your foots gonna hit
I can definitely feel the difference. How can you not.
Shorter cranks are easier on my old knees, not a BMX rider but I run 165s on all my bikes and I’m over 5’10”
I run 88mm cranks. Good for clearance.
TORQUE was the word Phu was looking for.
I'm 5'7 and I have a 24 Free Agent with a "21" topt tube currently it has 175mm crank on it . I'm thinking on switching to a 180mm crank. I need some opinions on this ?
Standard MTB has gone from 175 standard to 170 standard and DH is running 165 because there isn't much pedaling but Road Cyclists have also gone to 165 because it has been shown that seated pedaling aka spinning is more efficient with shorter cranks. I personally cannot tell a difference on the BMX bike while pedaling because you are standing and pedaling. I can tell if the bike has pegs or you are doing X ups or bar spins, if the frame is shorter. I think that more trail riders run the longer cranks because that is the more common size for BMX racing and most of us come from a BMX race background and don't run pegs, have longer top tubes and longer rear ends so we are not having issues with our foot hitting the peg or tire hitting our foot. As I said earlier its not easy to tell the crank length when standing an pedaling. That said I do think it all plays a factor in general stability and balance when going fast as well as your ability to do spins.
I run 180’s on my big ripper and I’m always the fastest plus I use big pedals
Most the just ride no...people who practice foot position probably. Where I notice it is riding mtn trail pedal striking is very noticeable since the ground your riding on is un even. The whole standing with legs apart na 10mm is .393/ or just a smidge over 3/8”. You won’t feel that really id say standing up. Just move your feet around. Where I would say felt a lot is when your riding long distances and your body starts to ache. And you’ll feel your legs chopping down do to tired hip area and your less I tuned to make full complete leg revolutions. It’s a cool topic I just picked up a gt performer 29er and I want a little bit taller rear freewheel like tooth or two do to less leverage of the 170mm to my only running 175mm. It’s what ever it’s avoiding pedal strikes off road or fast pedaling through a turn and not checking that pedal😂 that’s a trip when your rear scoots over.
I use 175 bmx 170 mbt
With the shorter cranks you can accelerate faster and put the same amount of power out in a shorter time period.
Phu is Epic! Phu! Phu! Phu!