Pre assembled Bearings & Studs are pressed in.
TrailMaster FR Wheel Hub 8.010.085 
Fits TrailMaster 
150 XRS 
150 XRX 
Blazer 150
Blazer 150 X
200E Xrs
200E Xrx
300 Xrs
300 XRX Go Karts
Includes Sealed Bearings , Seal ,and Studs.
Does Not Include  Brake Disc ,Wheel Nuts,or Rotor Bolts.
OEM Part
Part # 8.010.085
Front hub used on many Chinese 150cc/ 250cc/300 go-karts ( TrailMaster, Hammerhead, Carter, American Sportworks).