That slipping occurs when the braking force exceeds wheel load times friction coeff - at 0.8g in Wilson’s example, 40% above the max braking moment.
Hmm well you obviously have done more reading into this than my lunchtime spit balling. Still, I would think with good brake practice, loading the rear and then front, not over riding the conditions etc. These issues should be avoidable. As for brake force etc. I would think you would need some seriously strong hands to achieve that on rim, and I would think you would see the brake cable have issues with slipping if the cable before you achieve max braking, whatever that means (I assume it’s max braking force before irreversible damage to brake track occurs)
I guess what I am saying is I feel safer with dics over rims and when I owned rims, I was more worried about being able to stop in time rather than achieving max brake performance while not going over the bars
I must admit I’m looking to buy a new bike in the autumn and WANT rim brake. Easier to deal with in my view, far less chance of brake rub AND all my wheels are rim brake compliant so if I change to disc brakes all my wheelsets are useless!
Plus…never needed more stopping power than rim brakes could give me on the road. On my CX bike i have disc and see thw point of them…but they are a pain compared to run!
No, it’s max braking force before you pitch over. That’s way before any damage happens to your cables, brake tracks, name it. And you should be able to generate that without “seriously strong hands”.
We instinctively modulate braking force, and attaining max effort is actually pretty hard (I gave the F1 example above, the presence of brake assist for emergency braking in many cars is another, as most drivers are so surprised by the amount of deceleration a car can generate at max braking that we tend to back off the brakes even if we’re about to hit something).
This said - don’t use the rear brake if you really want to brake hard. Physics are against you.
I am sure my next road bike will have disc brakes. As to the death of rim brakes, that’s going to be overstated. There exists a large entry level and casual bike market that isn’t going to adopt disc brakes quickly, for one thing.
For another, niche bikes like TT bikes that aren’t upgraded as often by most are probably going to keep the rim brake around for quite a while. I was able to get a brand new set of HED Jet 6 Plus alloy TLR rims this year for about half price. They are currently running on my rim brake roadie, but once that is upgraded, they will become my full time tri/TT wheelset. With that wheel upgrade, I can’t imagine a scenario where I’m replacing my Cervelo P3C any time in the next 10-15 years. I can run tubeless 25s on 60mm deep rim brake wheels with excellent stopping power, better aerodynamics, and the aero differences in the frames isn’t advancing enough to make a difference worth paying for. For my n=1 anyway, I’ll have rim brakes prominent in my garage for another decade or more.
Obviously never had to worry about it before but ill take your word for it and im kinda ashamed to say im too lazy to crunch the numbers. I personally have had more issues getting significant carbon brake pad friction to achieve the desired stopping power, but i assume brake tracks improved over they years? Also was on a TT so the brakes suck on there. Regardless I am on disc now so ¯_(ツ)_/¯
Agreed, but you should be using both brakes, and you should be practicing safe riding and braking. I would never want to depend solely on the peak limits of my safety equipment. You will not achieve flipping with the rear brake alone.
No, but you will achieve something else: the rear wheel skidding out. I have quite the scars on my legs to prove the point
Join triathlon where you never have to brake!
You’ve never seen me “swim”. There’s a whole other set of physics problems at work there. Braking sure isn’t one of them. Floating, however…
I’d say this is another real-world aspect, where hydraulic brakes are vastly superior: you need less braking force and it really does make a difference if you have to brake a lot. Technically, this is independent from whether you have rim or disc brakes, but hydraulic rim brakes are exceedingly rare on road bikes, so hydraulic brakes essentially means disc brakes as well.
Good news, i expect a dump in 2nd hand market rim brake wheels
Rather than a new thread, what are the currently available electronic shifting, relatively high end (105-ultegra-DuraAce level) rim brake levers?
Am seeing:
Shimano is disk brake only now for Di2 with announcement of 105 electric.
Campy Super Record is available as rim brake set up for 12s
SRAM - Looks like they offer Red and Force 12 speed levers for rim brakes. Backward compatible to work with 11s derailleurs.
Do I have that right and did I miss anything?
Shimano has rim brake versions of the 12 speed Dura-ace (ST-9250) and Ultegra (ST-R8150) levers.
I think you mean 11s wheels not derailleurs, right