using ali brake pads on carbon wheels

Cuchilo

Prize winning member X2
Location
London
I'm going to let a mate try out a set of my wheels at a closed to traffic cycle track . Will I need to change his brake pads over for the short amount of time we are there so my wheels don't get damaged ? Its a fairly flat course and he should only need to brake once when we are done .
 
Location
Spain
Make him roll to a stop and then walk back to you.
 

fossyant

Ride It Like You Stole It!
Location
South Manchester
Carbon compatible pads are better for wet braking mainly. A fresh set of any pad would be ok for a test ride. But any metal in existing pads will scuff up the breaking surface on carbon rims.
 
Location
Loch side.
The difference between pads for aluminium rims and carbon rims isn't obvious. The ones for alu are made of rubber whilst the ones for carbon rims are made from organic material such as wood or cork. Rubber can melt and since carbon is such a poor conductor of heat, it does melt and then smear rubber on the braking surface, making for grabby and grubby brakes. If you brake and the pads melt - you don't have to brake much for that to happen - the pads effectively glide on liquid rubber and that of course means zero braking. Carbon pads are made from stuff that doesn't melt - think wood. It heats up but skips the liquid stage and goes directly to gas. This works better.
For a short ride and knowing that you could melt the pads and therefore modify your braking, there is no harm in using carbon wheels with rubber pads, other than the aforementioned metal bits inside most rubber pads used on aluminum. Koosltop pads don't pick up metal so if yours are Koolstop, ride away but watch out or melt.
 
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