One piece drive wheel for 5″ tire has flange to bolt on sprocket. Comes with bearings. Outside bearing to flange is 4″, inner bearing is inset inside of hub 1 1/8″ , 2 7/8″ 4 bolt sprocket bolt pattern.

Overall width, from front of wheel to the flange – 4 1/2″”

Note – Depending on kart, you may have to modify the rear axle by cutting off the old axle bolt and welding on a longer bolt.