Reserve Wheels Reserve 30 HD Wheelset - 27.5" 15 x 110/12 x 148 Center-Lock MicroSpline BLK I9 HydraReserve Wheels Reserve 30 HD Wheelset 27. 5" 15 x 110 12 x 148 Center Lock MicroSpline Black I9 Hydra. Reserve 30 wheels feature a 30mm internal width that supports 2. 3 2. 5" tires and the thick rim beads stand up to the abuse of tough rocky steep tracks ridden at elite speed. While DH rims see greater single impacts nothing beats the full weekend of regular abuse that an EWS race dishes out. To say nothing of the infamous Anti Grip and the rocks