SunRingle Duroc 40 EX 27.5" Rear Wheel (XD/MS) 148x12 BlkSun Ringle Duroc 40 Expert Rear Wheel 27. 5" 12 x 148mm 6 Bolt Micro Spline XD Black. Duroc wheels feature a lightweight double walled rim designed to support aggressive riding with high volume and true plus sized tires. SRX hubs are easily serviceable and offer 90 points of engagement. Includes everything you need to get riding both Shimano 11 and SRAM XD style freehub drivers tubeless tape pre installed valve and sealant SRX hubs use sealed