Upgrade kit includes:
Bearings
Seals
Watertight wheel collars
Bearing spacer
Two sets of O-rings
Collars and bearing spacer made of military hard anodizing to prevent wear
Collars incorporate Pivot Works watertight O-ring design to keep hubs dry
Replacement bearings and seals sold separately.
Bearings incorporate larger balls providing larger load carrying capacity, and now sit on the axle instead of the wheel collars