Novatec Black Hub (4 in 1) Set (D791SB & D792SB) for MTB Disc,Include Skewers,4 Bearings Front Hub: 145 g / 2 Sealed Bearings, 32 Holes, OLD: 100mm, Axle: 9x108, FTF: 62mm Rear Hub: 280 g / 4 Sealed Bearings, 32 Holes, OLD: 135mm/ X12 142mm, Axle: 10x145mm, FTF: 56.4mm Rear Hub Compatible with Shimano 8, 9, 10, 11 Speeds Rear Hub Compatible with SRAM 9, 10, 11 Speeds Speed Converter Included: 8s, 9s and 10s.