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Disc rotor risks are still here
Last Post 02/22/2018 03:33 PM by Cosmic Kid. 8 Replies.
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longslowdistance

Posts:1651

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02/11/2018 01:10 AM
http://www.cyclingnews.com/news/compton-injured-by-disc-brake-rotor-in-lille/ Compton gets a season ending knee gash from a rotor. Damn. Was this a sharp edged disc or rounded? I haven't seen or heard about mtbers being injured by discs. They crash sometimes, although rarely into each other. Maybe that's the difference?
79pmooney

Posts:1928

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02/11/2018 09:01 AM
I'm glad CyclingNews is showing that photo. (Warning - it's graphic.)

There is absolutely no reason a disc has to have a sharp edge. None. Maybe cheaper to make. But the edge has noting to do with how or why disc brakes work. Make the edge rounded. Put on a guard. One sentence from UCI would do the trick. So would just a small touch of common sense by an engineer or two at the brake companies.

Compton's injury is a "when and to whom", not an "if". That it happened to one of the world's best hopefully will wake a few people up.

I'd like to see the UCI simply ban sharp disc edges starting now. Make a few manufacturers jump as every wheel they have made will now be illegal. But they knew from the beginning this was going to happen. Just a matter of time. (We know UCI. That's not goit to happen. There will be more cuts.)

Ben
longslowdistance

Posts:1651

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02/11/2018 06:38 PM
I'll add as a medical person that her injury lined with mud in a cow pasture or dog poop filled park is a set-up for a nasty infection, too.
I'm incredulous that UCI is allowing razor sharp rotors in mass start competitions. A dope slap is in order.
6ix

Posts:244

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02/12/2018 03:28 PM
I really can't see how rounding the edges can help that much. They need guards.

This brings us back to the original debate of whether discs should be in mass-start races at all. I've said it a million times before but road discs are an answer to full-carbon wheels. Just because full-carbon wheels with carbon brake surfaces is a dumb idea doesn't necessitate the need for discs. Rather, just use aluminum braking surfaces and all is good again.
Cosmic Kid

Posts:2402

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02/12/2018 08:00 PM
Posted By Evan Solida on 02/12/2018 03:28 PM
I really can't see how rounding the edges can help that much. They need guards.

This brings us back to the original debate of whether discs should be in mass-start races at all. I've said it a million times before but road discs are an answer to full-carbon wheels. Just because full-carbon wheels with carbon brake surfaces is a dumb idea doesn't necessitate the need for discs. Rather, just use aluminum braking surfaces and all is good again.


This is a valid point....carbin makes for a less-than-optimal braking surface. Yes, it weighs less, but with the UCI weight limit capped, this is immaterial (and no, rotating weight really isn't the big factor we have been led to believe).

I still maintain that the *right* solution for road bikes is hydraulic calipers (see SRAM Red brake calipers). You get the advantage of the hydraulic "feel" without having to create new standards, endure the dangers of rotors, etc.
Just say "NO!" to WCP!!!!
Master50

Posts:338

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02/18/2018 07:16 PM
A rounded leading edge of a disk is a larger radius than regular 12 gauge spokes, Aero spokes are much sharper than a disk. straight edge disks are blunt only in 1 plane and that right angle can be pretty sharp
Cosmic Kid

Posts:2402

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02/22/2018 12:39 PM
Sounds like most suppliers are anticipating selling more disc-equipped road bikes this year vs. calipers.....Specliazed, in particular, is not selling any complete bikes w/ calipers. Want calipers, you gotta order a frameset and build it yourself.

Tipping point reached and passed....Caliper Year of Death - 2018.
Just say "NO!" to WCP!!!!
79pmooney

Posts:1928

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02/22/2018 02:00 PM
Shimano and Trek both stated (to VeloNews or Cycling News yesterday) that they were committed to offering both for the foreseeable future, Shimano for a very long time.

Funny, I have zero plans to switch and I live in one of those few areas where discs have another big advantage - no rim wear. Here in the NW, we go through rims at incredible rates in the winter. (A sidewall will barely get through two winters of commuting.) A frequent poster on another forum used to laugh off our claims of rapid wear, he a year 'round rider of 50 years in New York, asying all rim braked sidewalls would go, on average, far longer than the rest of the wheel due to hazards, spoke breakage, etc. Now he always qualifies that with "except in the Pacific NW".

Actually this is a sort of deja vu for me. In my Boston and Ann Arbor days of some distant millenium. my everyday wheels would go through one winter, hit April officially "square" and have that hub rebuilt with new spokes and rim. (400 gram so-so sewup rims. Soft metal that would yield hitting that bottomless pothole. Rim pullers - a frequently used tool!) Brakes also got progressively worse as the rim sidewall drifted further from smooth and flat. Mafacs were a real plus here. Those spongy things weren't really very fussy over such trivial matters.

Still using Mafacs. Actually just one set, converted to two front brakes for two different bikes. Now with better housings, hangers and pads than I ever had back then, quite nice stoppers! (Reminds me that one bike has grit in the rear pads firmly embedded. Good blasts from the garden home won't clean them. Need to pull the wheel and file the pads. Or rebuild the wheel in a few weeks.

Ben
Cosmic Kid

Posts:2402

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02/22/2018 03:33 PM
yeah, it was CyclingNews....and while both may be offered, the tipping point has been passed. From here on out, discs will outsell calipers (and the gap will only widen every year).

Local shop here won't even stock caliper brake bikes anymore...and we are in pancake-flat Chicago.
Just say "NO!" to WCP!!!!
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