The c55a is an aerodynamic road wheelset that remains stiff under power and comes equipped with an alloy braking surface allowing you to stop with confidence in any place and any weather it is a great set of wheels for multiple uses be it triathlon road racing or casual rides at 55 mm deep the c55 wheels offer significant aero advantage whilst the rim profile keeps things stable in heavy crosswinds they are tuned to absorb more road buzz resulting in a slightly more comfortable ride th