Wheels come sealed so that tubeless tires can be used (except 21” x 2.15” applications)
Hub width on wide rear wheels is measured from rotor to pulley mounting surfaces
4.25” wheels will fit most applications by modifying the axle spacers and changing the rotor and pulley spacing
5.5”, 8.5” and 10” wheels will require the above as well; frame, swingarm modification, and fender change along with a narrower belt may also be required