Quality Wheels DT 240 / Reserve 30 SL Carbon Rear Wheel - 29" 12 x 148mm 6-Bolt XD Ratchet DEG 90 CarbonQuality Wheels DT 240 Reserve 30 SL Carbon Rear Wheel 29" 12 x 148mm 6 Bolt XD Carbon. The Reserve 30SL carbon rim with DT Swiss 240 hub makes for a light weight trail ready wheel thats made to go fast. These wheels are built for you and the way you ride: balanced and responsive to go the distance delivering uncompromised untethered trail riding nirvana. Designed for trail riding and speed Reserve 30 SL rims feature carbon fiber construction with a 3.