Origin8 Bolt 21mm inner width AL6061-T6 alloy tubeless ready disc brake clincher with sleeved joint and post-anodized sanded gloss black finish Origin8 Bolt 21mm inner width AL6061-T6 alloy tubeless ready disc brake clincher with sleeved joint and post-anodized sanded gloss black finish Origin8 Elite convertible cross/gravel disc hubs with anti-bite Shimano cassette body featuring 6 pawl/54 point/6.6? engagement 28 hole 15TA front/28 hole 12TA rear 6 bolt cross/gravel disc hubs laced with J-bend DT Swiss Competition spokes Weight: 872g front/970g rear ISO-Mountain certified and assembled in the USA