The PD-R 550 SPD-SL Pedals are light and will deliver when you need them to. This is due to the large platform, which provides an excellent transfer of power. The composite pedal body is very light. The axle is made of strong chromoly steel and is embedded in sealed compact bearings, which dirt will have a hard time penetrating! The tension can be set to your personal preferences using the adjustable bindings. Ambitious road cyclists will be more than happy with the Shimano PD-R 550 SPD-SL Pedals.