so the groms can ride as hard as they want without the chain falling off

The RD-RX810 rear derailleur is compatible with road cassettes with a 34T low sprocket max

Lowest profile of any trainer

there is an adaptor for Shimano road bike cranks

Ventilation channels in the back padding ensure optimal air circulation and heat dissipation

Crank Brothers Mallet Trail BOA Clip-In Shoes - US 12 - Black - Gold Virtual Parent so the groms can rideSome things just work better together. Like an optimized shoe pedal combination. Crankbrothers Mallet clip in plays nice on the race track and at the bike park. It has a ramped Match cleat box for easy front and rear pedal entry and for mud shedding. A Race Zone setback on the cleat track allows the cleat to be positioned further toward the heel for added stability when descending. OUTSOLE: Match Box optimized for any MTB pedals Race Zone for control