With Shimano recently updating its venerable XTR group, the XTR PD-M9100 Pedals get a redesign as well, providing more stability, and the ability to shed mud better than ever before, along with 2 spindle length options. These improvements are the result of a refined pedal body shape that offers a wider edge-to-edge contact area over the outgoing 9000 pedals for an increased shoe to pedal interface and thus, better power transmission. It also features rounded edges to help shed mud and prevent accumulation. The retention mechanism is basically the same as the benchmark SPD pedals that's been around for decades with wide, open-ended tabs that allow easy entry and security when clipped in. The open design allows muck to flow through, so it doesn't hamper your ability to engage in a hurry and you can get back in quickly after an impromptu hike-a-bike or remounting after a sandy 'cross pit. The larger flat platforms on the inboard and outboard edges are also a boon to gravel riders looking to keep the sole of your shoe solid on the pedal, as are the two spindle lengths (52 and 55mm) to dial in your fit. The XTR PD-M9100 Pedals come with SM-SH51 (single release) cleats and are also compatible with SM-SH56 (multi-release) cleats. They have chromoly spindles and spin on sealed bearings. The tension of the retention mechanism can be adjusted via a hex screw on the back of each pedal on both sides.