The C55A clincher with alloy braking surface is a great all-round wheel that can take whatever punishment you can throw at it. With a 55mm aero profile rim, these wheels give you a distinct advantage on the flats. Under power you’ll discover efficient power transfer, & when sprinting, the wheels stay firm underneath you. The 55mm rim profile is easy to control even in side winds thanks to its aero design. With 20 spokes up front & 24 in the rear, this slightly higher spoke count means lower spoke tension resulting in a more comfortable ride. Weighing in at 1, 573g a set these wheels are very competitive in the weight stakes. TBT BEARINGS TBT Bearings (Tiramic Bearing Technology) deliver outstanding performance. Ceramic balls are 60% lighter than steel, extremely durable, smoother & accelerate faster than their steel counterparts. The starting torque of Tiramic Bearings is only 74% of normal bearings while the turning torque is only 67% of normal bearings. Both these factors significantly reduce chain drag making pedalling lighter & your ride much smoother.