The fast forward f4r c clincher wheelset most all round wheelset for the enthusiast and competitive racer looking for clincher wheels with 45mm deep carbon rims the f4r c is easy to handle and therefore also perfectly suited for riding uphill the joint of the aluminium brake surface is welded for better brake performance and the rim has wear indicators to advise when the rim needs to be replaced darc stands for double arc which is the profile of the rim this compresses air on the rim to cr