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UCI gives tenative approval on disc brakes for road racing
Last Post 04/17/2015 11:07 AM by Orange Crush. 23 Replies.
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Author Messages
Cosmic Kid

Posts:2146

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04/14/2015 09:57 AM
"Disc brakes will never catch on for CX or the road. No major manufacturer will ever spec them."
Just say "NO!" to WCP!!!!
Yo Mike

Posts:338

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04/14/2015 11:28 AM
3 tentative questions for this tentative approval:

Are discs more aerodynamic?

Will this bring Andy Schleck out of retirement?

Won't a 'mixed peloton' of disc / rim brakes cause problems, or is that 'part of the plan'?
6ix

Posts:203

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04/14/2015 11:37 AM
Expanding on the mixed peloton concern, what about mixed local group rides and amateur crits? Newbie riders are squirrely as hell already. Can you imagine a scenario where you have some riders using discs and others on carbon hoops? Carnage, total carnage. Even more carnage than the latest Terminator: Genysis movie trailer.

Here is what industry leaders need to get figured out: a open-release lever at the brake hoods that increases the pad/rotor clearance. There isn't enough wiggle room with the systems currently being used. Even with thru-axle hubs there is a strong chance to have some rub. I can handle have a little rub on a mountain-bike but on a road bike? Oh hell no.
longslowdistance

Posts:1472

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04/14/2015 02:17 PM
Agree about the brake rub issue, which is potential fatal flaw. I'm not an engineer so maybe I'm naive. Why isn't ISO ISO?
Cosmic Kid

Posts:2146

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04/14/2015 06:32 PM
@ Yo Mike....

1) No

2) gawd no...don't even think that!!

3) IMO, there are already a ton of braking variables in any group / peloton....carbon vs aluminum, different pads, singe vs dual pivot, etc. people seem to manage OK. I don't really see a concern here.
Just say "NO!" to WCP!!!!
SideBySide

Posts:427

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04/15/2015 01:09 PM
There are going to be some pi$$ed off riders if the wheel is harder to get on the bike in the heat of the moment.
THE SKINNY

Posts:506

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04/15/2015 01:34 PM
just another way to sell more bikes.
How we spend our days is, of course, how we spend our lives.
vtguy

Posts:298

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04/15/2015 02:53 PM
I love the disc brakes on my Mt. bike, and I'll probably get them the next time I buy a new cross bike...but on my road bike, my Shimano Ultegra's work just fine. I guess I agree with The Skinny.
Cosmic Kid

Posts:2146

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04/15/2015 04:09 PM
Posted By carl x on 04/15/2015 01:34 PM
just another way to sell more bikes.


Yeah, it really isn't. Bike suppliers are already selling road bikes (not CX, road) bikes with discs. The vast majority if road bikes sold never see competition and the overwhelming majority of consumers have no ideas who races what in bike races (mostly 'cuz they don't follow the sport).

Never once in my years in the bike biz did I ever sit in on a meeting whee the idea was to come up with ideas to develop bikes to hoodwink consumers into thinking they needed something new.
Just say "NO!" to WCP!!!!
Ride On

Posts:537

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04/15/2015 04:15 PM
Someone riding a disc brake raod bike is going to grab to much brake in a panic and go flying over the front. It's going to be a huge mess.

Then they will introduce anti lock brakes to solve that problem. Solution / problem / solution / problem.
Ride On

Posts:537

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04/15/2015 06:53 PM
I think we've talked about this before, stoping distance is determined by tire to road friction not pad to rim friction.

People who claim that wet stoping distance is going be much better with disc brakes are ignoring that the friction of tire to raod is much reduced when the road is wet.

Cars introduced anti lock brakes because in a panic people stomp on the brakes and skid the car. No one would listen to their dad and pump the brakes.

I suspect the same will happen with bike disc brakes. In a panic people will grab as much brake as they can and skid , loose control and crash. Yes disc brakes have better modulation and could stop you sooner in a panic but even the most skilled rider will put them on full force in a panic.

If they kept data on these things I bet disc brakes would have zero impact on crashes and injuries. My guess would be they actually makes it worse since in a panic you are going to grab as much as you can. Will they make you faster ? Yes probably. You can brake later but again that won't make you any safer.
Orange Crush

Posts:1995

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04/15/2015 07:11 PM
You are going offtrack in the very first sentence. Under normal conditions tire friction is the limiting factor. But under wet conditions brake pad to rim friction reduces to 1/10th of that during dry and becomes the limiting factor. It takes 20-30 bike wheel revolutions for this wet factor to be mitigated and for pad to rim friction to get closer to what is was under dry conditions. That initial period is where rim brakes lose out in wet and where you get that "no brake" feeling.
Ride On

Posts:537

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04/15/2015 08:39 PM
Rim brakes in the wet are safer.

My logic goes like this. Rim brakes in the wet keep you from locking up the wheel cause as you point out they just won't no matter how hard you apply the brakes. Sure stopping distance is far but the wheel doesn't lock up.

With disc brakes you will be able to lock up the wheel in the wet. A locked up skidding wheel in the wet is very hard to control.

Hence a rim brake is safer than a disc brake in the wet when/if apply the brakes hard. You will apply the brakes hard when you panic.
Orange Crush

Posts:1995

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04/15/2015 09:16 PM
I have a road bike with rim brakes and a commuter with discs, been riding in the pissing cold rain since Oct as I do every year, so reasonably good comparison.

I have no problem generally with rim brakes in wet but couple times each year get that no brakes, hazarsd up close moment that takes some quick action. Disc brakes you get 100% confident braking.

I have yet to lock up a disc in wet; modulation is excellent. Only times I locked them up have been on during frost days on black ice patches and the white striping on road which has lower friction when covered with frost.

Would I consider discs for road? Not until they are the norm and can't get around them. They look like a pig on a road bike, pad wear is horrendous when riding on wet gritty roads and I hate the zing zing sound that grit makes. But safe they are, that I am convinced off.
Ride On

Posts:537

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04/15/2015 09:19 PM
You have experience, I only have conjecture, so I bow to your thinking.
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