These fit most Pride, Jazzy, Quantum, Merits and other electric wheelchairs with 200 x 50 (8x2) casters tires with 5/16" installed bearings. Tire Size: 8"x2" (200x50) Total width from bearing to bearing is approx. 2 3/8" Solid caster tires with rims and 5/16" bearings. Bearing: 608ZZ Material: EVA