700c carbon rims road alloy brake for road bike, stiff popular!!!!1.alloy brake. 2. ... 3.strong. 4.700c road Item: 700c road bike carbon rims with alloy brake, strong!!!!Depth: 38mmVersion: ... -high temperature basalt resin. when riding, especially for a long time downhill riding, the wheels generate ... accumulated, that would be a big problem for the safe bike activity. Luckily, basalt, a good material ...