Front Hub Custom SL 6061 body / 7075 axle, 2 sealed bearing, 6 bolts pattern 15mm x 100mm axle width / Thru Axle. RearCustom SL 6061 body / 7075 axle, 9-10-11 Shimano / Sram body compatible, 6 pawls, 4 sealed bearing, 6 bolts pattern 12mm x 142mm axle width / Thru Axle.