lordconqueror wrote:CharlesM wrote:My only wonder on road versus cross is heat handling for very small calipers. I would guess smarter folks than me have worked it out...
one of the articles floating around (maybe VeloNews?) mentioned something about Todd Wells riding the calipers all year, so I assumed that meant for XC racing. Seems like that would be a reasonable way to confirm if their design had problems with heat buildup.
CX has no place near the heat build up potential that Road use does...
thisisatest wrote:I've said it before, can't wait to be proven right: small, wide, vented rotors. Shimano's IceTech aluminum core could be put to great use there too.
I'm using the RT86 (Ice Tech ) rotors at the moment on my road bike with TRP Parabox.
They work really well, and even after a hard descent riding brakes (due to car traffic), there is stuff all heat transfer to the hub via the alloy spider.
Looking fwd to trialling the HydroR for the road
This problem will be solved in the same ways that it was solved for cars. You can use vented discs, more massive discs, carbon discs, carbon ceramic discs, larger swept area (which in this aspect means that you would go further in from the 140-make the pads taller), greater pad surface area (make the pads longer), put cooling fins on the calipers, etc. The engineers will figure it out.
My guess is they make the pads bigger in both directions, lower the leverage ratio, and put cooling fins on the calipers. Maybe vented discs too.
yourdaguy wrote:On road tires you probably don't want anything larger than a 140 disc because it will provide too much leverage and too easily lock the wheel. That said, on long descents these small rotors would easily overheat.
Based on what experience ?
I currently run a 180mm front disc and have NEVER locked the front even in the wet.
Have been running road disc setup FOR OVER 12,000km now
yourdaguy wrote:I don't know what kind of disc brakes you have, but my 5 sets of Elixir CR's that I have on my Mountain bikes would lock my road bike tires way too easily. Even the regular rim brakes on my road bikes can easily lock the rear and with great effort can lock the fronts. The hydraulic brakes on my mountain bikes (all 160 rotors) have way more power.
I have the TRP parabox setup.
As mentioned many times, hydraulics and discs give you much greater modulation so you don't lock brakes. Grip levels are entirely different.
So your statement should be preceded with "I have no road disc experience , but maybe ....."
I have also used a variety of tyre sizes and brands ,as well as tubeless.
If you can, ride a road disc ( not a cx bike) sand see what the reality is
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