Crankbrothers Synthesis Enduro I9 Alloy Wheels are tuned to provide control and stability for enduro riding and racing. These Synthesis wheels are equipped with premium I9 hubs. Crafted with an Industry Nine 1/1 Hub for 6-bolt disc Stiff tuned rear wheel supports peak loads and enhances stability and tracking at speed Narrower inner rim width supports narrower tire profile in rear, improves rolling resistance, and sharpens tire edge for grip Welded and sleeved rim joint for additional strength Presta Valve Spoke count: 32 Rear Axle: 12mm Thru x 148mm Rim Width (Internal): 29.5 Cassette Body Type: SRAM XD Valve: Presta Wheel Size: 27.5" Defined Color: Black ISO Diameter: 584 / 650b / 27.5" Tire Type: Tubeless Ready Clincher Hub/Brake Compatibility: 6-Bolt Disc