Description :

[ Model ] XM550 Boost MTB Hub,32 Hole, Front :20x110mm,Rear : 12x157mm Super Boost , Specially Used for Heavy Mountain Bikes .
[ Materials ] Aluminium 6061 + Aluminium 7075 .
[ Specifics ] 32 Hole,6 Bolts,14 Guage,with Widened and Thickened 4 Pawls-2 Teeth with 40T Gear Ring,Providing More Stable and Reliable Operation .

[ Application ] Fit for FR/AM/DH Mountain Bikes,Compatible with Shimano 8-11 Speed .
[Package including ] 1pcs Boost MTB Hub ,Front or Rear , Which One By Your Choice .