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Innovative brake in old magazine.

Old 03-11-22, 02:54 PM
  #26  
chaadster
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Originally Posted by livedarklions View Post
Must say, I don't have enough experience with wet straps of kevlar to know if that's credible.
As if you’re in any position to question the credibility of research assistant at DuPont’s Advanced Material Systems who holds a patent on aramid fibers as a wear additive…. Come off it, Jack.
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Old 03-11-22, 03:25 PM
  #27  
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Originally Posted by chaadster View Post
As if you’re in any position to question the credibility of research assistant at DuPont’s Advanced Material Systems who holds a patent on aramid fibers as a wear additive…. Come off it, Jack.

You actually think I was serious? The joke is no one sees wet straps of kevlar.

Wait, you aren't seriously debating the merits of this long-defunct product, are you?
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Old 03-11-22, 03:51 PM
  #28  
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Originally Posted by EZgears View Post
Anyone remember reading an article about a new kind of break? This was back in the 90's I think. Might have been in popular science or popular mechanics. Someone came up with basically a groove like a pulley that went around the circumference of a rim. In this groove there was a Kevlar cord that went clear around and when you pulled the break lever it tightened the cord in the groove causing friction to stop the bike. It never did catch on but it was supposed to stop a bike very quickly.
Can't safely stop any more quickly than you have available traction.

Sounds like a concept from someone who didn't think it all the way through.

There'd be a not-insignificant drag on the wheel even when "loose"... and if too loose you risk the cord coming out of the groove and then you'll have a real problem
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Old 03-11-22, 05:33 PM
  #29  
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Originally Posted by surveyor6 View Post
Probably wouldn't work very well in wet conditions.
Per the article in post #13, braking performance increases by 25% when wet.
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Old 03-11-22, 05:58 PM
  #30  
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From the link.
Rear wheel only. The inventor says it replaces two rim brakes. Uh, no it doesn't.

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Old 03-11-22, 08:41 PM
  #31  
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Originally Posted by rm -rf View Post
From the link.
Rear wheel only. The inventor says it replaces two rim brakes. Uh, no it doesn't.

Who wouldn't want constant brake rub?
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Old 03-11-22, 08:43 PM
  #32  
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Originally Posted by Shimagnolo View Post
Per the article in post #13, braking performance increases by 25% when wet.

Judging by that picture, then you wouldn't be able to ride these in the rain because there would be constant high friction against the rim.
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Old 03-11-22, 09:23 PM
  #33  
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Originally Posted by rm -rf View Post
From the link.
Rear wheel only. The inventor says it replaces two rim brakes. Uh, no it doesn't.
There a huge risk of damaging that thing in a kerb, pothole, or hitting a rock when you lean in a turn.

Totally unsuitable for MTB nor off-road or gravel riding.
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Old 03-12-22, 11:02 AM
  #34  
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Originally Posted by rm -rf View Post
From the link.
Rear wheel only. The inventor says it replaces two rim brakes. Uh, no it doesn't.

Looks like an April fool's joke to me.
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Old 03-13-22, 08:29 AM
  #35  
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Originally Posted by livedarklions View Post
Someone should start an "innovations that flopped" thread. Then we can link it whenever someone posts the "they laughed at the Wright Brothers" cliche.
You mean all those bicycle-related patents from the late 1800s and early 1900s that have covered pretty much every "new idea" that we see these days? Having been in this racket for a few decades, you can dependably expect "breakthrough" products involving cam cranks, non-round chain rings, FWD/AWD, continuously variable gearing, shaft drive, puncture-proof tires, and on and on. The fact that these things have failed in the market repeatedly never seems to daunt the next generation of inventors/promoters.
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Old 03-13-22, 02:57 PM
  #36  
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Originally Posted by KerryIrons View Post
You mean all those bicycle-related patents from the late 1800s and early 1900s that have covered pretty much every "new idea" that we see these days? Having been in this racket for a few decades, you can dependably expect "breakthrough" products involving cam cranks, non-round chain rings, FWD/AWD, continuously variable gearing, shaft drive, puncture-proof tires, and on and on. The fact that these things have failed in the market repeatedly never seems to daunt the next generation of inventors/promoters.
JATO or bust!
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Old 03-13-22, 04:22 PM
  #37  
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Look what I found! It's the Yankee Bicycle after Nordic Trac bought him out, complete with kevlar brake and radial gears:
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Old 03-15-22, 04:48 AM
  #38  
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Good, the idea is still around then. Others will improve on it more. I like the shifter idea, wish I could have tried out a Yankee bicycle back then.
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Old 03-15-22, 06:14 AM
  #39  
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Originally Posted by livedarklions View Post
Look what I found! It's the Yankee Bicycle after Nordic Trac bought him out, complete with kevlar brake and radial gears.
Good find! I've never heard of radial gears before. I'll have to read up about them.
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Old 03-15-22, 07:10 AM
  #40  
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Originally Posted by Velogoth View Post
Good find! I've never heard of radial gears before. I'll have to read up about them.
You are still using the old bias-ply gears???
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Old 03-15-22, 11:28 AM
  #41  
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Originally Posted by livedarklions View Post
Look what I found! It's the Yankee Bicycle after Nordic Trac bought him out, complete with kevlar brake and radial gears.
Here's a fairly recent review of the bike: https://bikenewengland.com/2018/06/1...-transmission/
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Old 03-15-22, 11:54 AM
  #42  
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Originally Posted by Velogoth View Post
Here's a fairly recent review of the bike: https://bikenewengland.com/2018/06/1...-transmission/
Thanks!
I must say, that is one diplomatic review, just glancing over the constant brake rub and pieces of plastic breaking off of the gears!

It'd be an interesting conversation piece if you could find one, but even if functioning, it doesn't sound like a fun ride. The rub would drive me nuts.
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