SRM X-Power Road Power Meter Pedals - DualThe SRM X Power Road pedals deliver class leading power measurement accuracy, maximum flexibility, and seamless integration. The electronics are housed inside the pedal spindle, so the pedal's slim silhouette mirrors the Stack Height and Q factor dimensions of a standard SPD SL compatible pedal. And that means power measurement without the heft and height compromises that come with typical power pedals. This is the dual leg power measurement version