Quality Wheels DT 240 / Reserve 30 HD Carbon Rear Wheel - 29" 12 x 148mm 6-Bolt XD Ratchet DEG 90 CarbonQuality Wheels DT 240 Reserve 30 HD Carbon Rear Wheel 29" 12 x 148mm 6 Bolt XD Carbon. The Reserve 30 HD wheel features a 30mm internal width that supports 2. 3 2. 5" tires while the thick rim beads stand up to the abuse of tough rocky steep trails ridden at elite speed. Off road rims can see greater single impacts but nothing beats the full weekend of regular abuse that an EWS race dishes out. Designed for off road aggressive trail riding and racing