Shimano Dura Ace XTR RT-CL900 road and mountain bike disc brake with internal clamp nut

The main improvement in the Shimano RT-CL900 disc is the maintenance of braking quality with better control of noise caused by overheating.

It's done! Quieter than ever, the RT-CL900 disc ensures your safety in all conditions and on all terrains.Problems with deformation due to overheating have been virtually eliminated thanks to a new arm shape and the addition of heat-dissipating paint. The result is clear: improved braking performance and unrivalled quiet operation.We recommend mounting 140 mm at the front and rear for maximum weight savings and/or 160 mm front and rear for optimal braking, or 160 mm at the front and 140 mm at the rear for a combination of lightness and efficiency.This disc version comes with an internal spline lock nut, identical to those used on cassettes. The appropriate tool is the same as that used to mount a bicycle cassette.Technical specifications New ventilation concept New shape Ice Technologies Freeza heat dissipation Centre Lock With internal spline lock nut 140, 160, 180 or 203 mm Weight: 96 g in 140 mm, 114 g in 160 mm