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Tirade on road discs
Last Post 11/18/2014 03:56 PM by Cosmic Kid. 81 Replies.
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ChinookPass
Posts:809
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| 11/11/2014 01:34 PM |
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This thread has a lot of opinions, a few anecdotes, and even some nifty calculations. But there must be some data out there from races over the past year. I'm betting someone has been in a mass-start road race with other riders using discs in which there has been an opportunity to explore their effects and whether they were an adverse factor in a pileup or not.
On a different note, regarding commuting, I'm riding my "D" bike this week while waiting for parts to rebuild my hubs, and am missing the discs in the wet. This bike has the worlds worst p.o.s Cane Creek cantis. I'm really having to think about braking this week. |
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longslowdistance
Posts:2881
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| 11/11/2014 02:24 PM |
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Hey CP,
To answer your excellent question would require that discs be allowed in road racing. Catch 22. It might be dangerous so it can't be tried in real use. The only we would allow it is if we know it's proved to be safe in real use. Got that Capt. Yossarian?
Maybe someone with skill has been using discs in fast group rides, that would be similar.
I surely agree 100% that commuter and adventure bikes are a perfect application for discs.
I'm loving my TRPs on my gravel road bike. I still haven't tested them on a high speed paved fast-slow-fast-slow descent to see if they fade. No problems with drag braking down gravel descents, but I don't think that's similar. |
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longslowdistance
Posts:2881
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| 11/11/2014 02:25 PM |
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| PS: to Capt. Yossarian and all of the others: Thank You on this Veteran's Day. |
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ChinookPass
Posts:809
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| 11/11/2014 03:22 PM |
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| I know they are banned by the UCI but are they also banned from USAC races? OBRA? The Tour of Podunk USA Crit? |
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jacques_anquetil
Posts:245
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| 11/12/2014 09:58 AM |
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CP has a good point. If we're participating in local-level USCF, CCA or whatever affiliation race, doesn't the highest level of UCI equipment qualification count? like, you can't race your 20" bmx in a crit or not have brakes installed. that said, unsanctioned races and events might be a wild-west free for all.
one criticism from a pro that might be valid is what happens if you crash in the pack after a hard descent, and fall on a red-hot calliper. that'd leave a mark. |
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Dale
Posts:1767
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| 11/12/2014 11:37 AM |
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Posted By jacques anquetil on 11/12/2014 09:58 AM
what happens if you crash in the pack after a hard descent, and fall on a red-hot calliper. that'd leave a mark.
Look on the bright side, if you get slashed by the red hot, razor sharp rotor the wound will be instantly cauterized and you won't bleed much.
You guys are such Debbie-downers  |
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Cosmic Kid
Posts:4209
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| 11/12/2014 10:32 PM |
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Posted By jacques anquetil on 11/12/2014 09:58 AM
CP has a good point. If we're participating in local-level USCF, CCA or whatever affiliation race, doesn't the highest level of UCI equipment qualification count? like, you can't race your 20" bmx in a crit or not have brakes installed. that said, unsanctioned races and events might be a wild-west free for all.
one criticism from a pro that might be valid is what happens if you crash in the pack after a hard descent, and fall on a red-hot calliper. that'd leave a mark.
USAC races never check bike weights and routinely let non-UCI compliant tri bikes race in TT's unless it is a UCI race. |
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| Just say "NO!" to WCP!!!!
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Keith Richards
Posts:781
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| 11/13/2014 02:35 PM |
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I don't think it will make nearly the difference people think it will make due to the limiting factor of the tires.
When I first got dual caliper brakes, I almost went down the first time I used them such was the difference in brake lever feel. Brake lever feel is what will change a lot, braking distances not so much I think. |
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It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong. |
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79pmooney
Posts:3180
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| 11/13/2014 03:00 PM |
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Keith, I paired up dual pivots with V-brake levers on my new fixie. Love the combo. Takes a solid squeeze to stop hard, but they will. That panic grab? No lock-up. Perfect for fast descents on rural pavement. Only drawback is less than full power braking over the tops. But for that bike and HBs, I prefer riding the drops anyway.
Another plus - wonderful, huge lever hoods, longset I have ever seen.
Ben |
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longslowdistance
Posts:2881
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| 11/13/2014 07:53 PM |
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| Good point KR. This would be another nudge towards wider tires with lower pressures in some settings, i.e. to take advantage of better brakes. |
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Gonzo Cyclist
Posts:568
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| 11/15/2014 02:23 PM |
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as i saw this post, my 1st question was, "What kind of disk brakes do you have?"
Avid/SRAM are terrible at best, Shimano has one of the best, and my favs are Maguras, I won a pair of their new NEXT bakes at Interbike, can't wait to get them set and use them, but mt MT's are working great.
Rubbing does happen on the trail at time, ding a rotor, sometimes they warp from high heat, or if you glaze the pads, then they squeal like holy heck.
As OC states, on a commuter, in the rain, they are the best, coolest thing was no black mess all over your rims, bikes, etc....
I have a pair of Shimano CX77's on my bad weather/commuter bike, these put Avid mechanicals to shame, in performance, and set up
as for rotor size, I do believe that you get more power, and better modulation, never thought about the cooling effect, but that makes sense |
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Keith Richards
Posts:781
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| 11/17/2014 12:50 PM |
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In the car world we tell people all the time, if you want to stop get sticky tires. Big brakes won't help if the road/tire contact point is middling.
The irony of it is that the thing that they use to market cycling tires, low rolling resistance, is exactly the OPPOSITE of what sells performance tires for cars. Low rolling resistance tires are for high MPG uses (Prius is a good example of a car with low rolling resistance tires to aid in efficiency). Performance tires for cars are super sticky (some of them cannot even be stored, much less used, below 40 deg!) to aid in braking and cornering.
Just throwing some stuff out there to think about. |
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| -----
It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong. |
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79pmooney
Posts:3180
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| 11/17/2014 02:39 PM |
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Keith, a funny. A few years ago, the Vittoria winter tire came out. Heavy, sticky tread, a stopper. Bought a pair for my winter fixie from the shop that was well known in Portland as the fix gear place, (Owner sponsored and coached a velodrome team.)
Went in a few weeks later to report on the tires. Owner said that he was going to stop selling them; the fixie riders were bringing them back because they were hurting themselves trying to stop. Pulled muscles and the like because they wouldn't skid!
Ben
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Keith Richards
Posts:781
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| 11/17/2014 05:06 PM |
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lol! I have been buying these mid range Schwalbe tires for a while now, Luganos.
They wear out fast and I can FEEL the extra rolling resistance from them but DAMN if they are not the best cornering tire I have ever used. I can actually feel the tires load up in a corner. |
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| -----
It is his word versus ours. We like our word. We like where we stand and we like our credibility."--Lance Armstrong. |
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Cosmic Kid
Posts:4209
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| 11/17/2014 05:50 PM |
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Rolling resistance be a bigger time / performance suck than aerodynamics.
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| Just say "NO!" to WCP!!!!
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