Rear Wheel Bearing Upgrade KitBearings incorporate larger balls providing larger load carrying capacity, and now sit on the axle instead of the wheel collarsUpgrade kit includes bearings, seals, watertight wheel collars, bearing spacer and two sets of O-ringsCollars and bearing spacer made of military hard anodizing to prevent wearCollars incorporate Pivot Works watertight O-ring design to keep hubs dryReplacement bearings and seals sold separately