- Threaded for track cog and lockring on one side and BMX freehweel on the other
- Bolt on axle , MTB
- Adjustable, sealed, full-compliment angular-contact bearings; same 7901 bearings used front and rear
- Standard, easily-replaceable, non-proprietary, CroMoly axles
- Surly Fixed/Freewheel MTB rear hub
