Brakes: Long and Short Pull Systems | Tech Tuesday
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- Опубликовано: 8 фев 2025
- Did you know there are short pull and long pull brake levers and caliper? WHALE you do now! This Tech Tuesday is all about work transfer, and making sure you're getting the most bang for your buck energy-wise in regards to braking. We'll explore exactly what the difference is between long pull and short pull braking systems, and what happens when you mix-and-match them.
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I haven’t physically touched a cable actuated brake for well over a decade but I’m always interested in hearing Calvin educate me.
Best explanation of this tricky (for me) issue I have ever seen. Complete clarity. Thank you.
Just to complicate matters, the Tektro RX1 brake at 5:42 is a "mini V-brake" with 85mm arms - shorter than a regular linear pull brakes, but longer than cantis. Functionally identical to the more expensive TRP CX8.4 which is (or was) primarily marketed for cyclocross use with short pull road levers. Very effective brakes, but need careful setup to get sufficient rim clearance.
When park tool shows a video, I fully watch it😊
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Your use of the squeaking whale was genius. What an effective way to so intuitively help us understand these concepts, and more importantly, remember them. 🐳
Always feels great to listen to this wise moustache man ✨😎🍀
Wow, this is great! I now understand why my “upgrade” to my ‘86 Paramount hasn’t been as crisp as I’d like. The paramount was purchased as a frameset originally and built up with parts on hand (back in’86). I used mostly early (‘82-84) Record components (matching brake set) and everything was fine. Then years later I switched the brake levers to late 80’s Record aero style. I ended up with that “squishy” feel that you describe! And no amount of cable “stretching” would resolve it!
Wish I’d known this 10-15 years ago!😂
just had this problem with the compatibility some weeks ago when I build up a bike with spare parts that lay around. now I know why it was so squishy in the lever. super video.
Hey, Calvin! Where the heck were you when I was at school?!!
Extremely good information. Thanks indeed!
This was fantastic, both in terms of the writing as well as the graphics. Thank you, folks.
An an engineer, albeit an electrical engineer, I appreciate very much this straight forward mechanical explanation of long and short pull brakes.
Good stuff Calvin. Yes. Even in the automotive world this is a ratio study. Very well put together without getting in to all the math.
Yes I agree.. rod to stroke ratio. Torque vs wear...
Amazing illustration!
*Suggestion for the **_BPTT-2_* Make it so that it can be filled with water. A little *water jet* would be coming out on top when a force would be applied, *helping people with a hearing loss see the difference.*
The height of the water jet would be proportional to resulting exerted force.
But the BPTT-1 's squeekiness just makesme smile.
@@morlamweb
Then the solution is to market it as the BPTT-1S. The S standing for *_squirting_* and being made for those with _special needs._
The height of the water jet would be proportional to the resulting brake movement.
To measure brake force (which is on the order of units or tens of pounds/kg of force) you need a much heavier duty BPTT)
@@CalinCETERAS
You must be a women magnet in a party.
Thank you! You have the best teaching
Some Shimano mountain brake/shifter combos can switch between short-pull and long-pull compatibility.
Really cool editing on this video
Thanks Calvin. Superb, informative as always.
Does Park Tool offer an official BPTT LMAO.
Thanks as always Calvin, my go-to guy on RUclips for helping me understand bike-nerd stuff. The BPTT made simple a concept I've scratched my head at for years. And thanks for adding the fact that there is no real industry standard for LP vs SP - shocking in today's bike industry LOL.
Great job Park and Calvin.
Always love the information and the presentation you provide. Thank you for what you do.
100% achievement price for this explanation!
You definitely need to continue this with a discussion on the actual pull-ratio of e.g. modern Shimano STI levers (super-SLR?), that is somewhere in-between short- and long-pull. And is there something similar on the SRAM side with their road brake-levers?
My LBS installed a "travel agent" to adapt the short pull brake lever/shifters I wanted on my new bike to the long pull cantilever brakes the bike came with. The system has been working great since 2003.
Great video as usual! Please make a video about the correct cantilever brakes settings up! Thanks ;)
Thank you very much for this outstanding video !
Thanks for info
Hello Calvin , impressionnant de précisions 😊 Thank you ✔️
I need the bptt-1 tool !! Take my money
That’s why "park tool" Thx u sir, I got the point 👌
I ride since about 1985, but I didn't know this. Thank you!
Informative and entertaining! Is the BPTT available in Park Blue?
Nice Calvin
Damn, now I have to go back to work and replace a few brake levers.
I upgraded the hybrid shifter to road and the front derailleur just did not shift due to different pull ratio. Ended up replace front derailleur to road type as well.
Very nice. How about the cable pull ratio adapters that are available?
The "Travel Agent®" has been discontinued. It was a good fix, but no longer available.
@@parktool There are chinese "copies" by Litepro, a brand well known for Brompton tuning parts.
Buen video un favor podrías hacer un vídeo de sangrado o purgado de frenos xt slx Saint
Brakes mechanical advantage for Dummies. BPTT is pure genious.
I farted 4 times during this, great video 🎉
Thanks.
With that video in mind, I will be able to avoid those sharks trying to sell me a used bike built with incompatible parts.
PLS make a video to BLEED HOPE BRAKES :)
I hope it is not an instruction for brakes designers :)
But personally, I glad to have seen it. I had couple of bikes were the brakes were really hard to press and I think I now know why.
"well over an inch", that's what she said 😮 (probably not)