Re: Bigger disc brake

On Jun 26, 5:24 am, "Roberto Baggio" <baggi...@xxxxxxxxx> wrote:

With a lot of continuous braking, there is a great amount of heat generated.
A disc brake, with the correct pads, will do a better job of performing
under heat. That's why an 8" rotor is often used instead of a 6" rotor as
the larger rotor can dissipate heat better.

Exactly right: the real advantage of a larger rotor is heat
dissipation. Of course, no disc will dissipate heat as well as a rim
brake, since the dissipation rate is going to be proportional to
surface area. I can believe that disc pads will _have to_ perform
better when hot than rim brake pads, since, all else being equal, disc
brakes will get a lot hotter. I have gotten rims too hot to touch on a
number of occasions.

Note that none of this has anything to do with more mechanical
advantage from a larger rotor.

CC



.

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