Industry Nine 1/1 GRCX Wheel Rear 700C / 622 Holes: 28 12mm TA 142mm Disc Center Lock Shimano HG 11The unasumming, but advanced 1 1 Road drive mechanism keeps pedal power transfer consistent and predictable, available at a split seconds calling courtesy of the 4 degree hub engagement With a 24. 5mm inner rim design, the 700c GRCX rim shines on rides that see both road and gravel Perfect for backcountry or touring adventures, 1 1 Road brings Industry Nine performance to new riders and new routes TECH SPECS Rim External Width 28. 5mm Rim Internal