Kryptonite wheel bearings are the highest quality replacements available. Exclusively from Kryptonite and designed to handle higher stresses put on your UTV from larger tires and performance upgrades. Distinctive ball and taper bearing arrangement. Reduced deflection of hub face provides better braking and handling. Improved steering accuracy and behavior. We have been using and abusing these bearings on our personal UTV's for years and it's because of that we feel comfortable offering our Lifetime Warranty! Average install time is around 2 hours each.