The Drive Chain Sprocket mounts on left side of the rear wheel against the spokes dish side in. The sprocket must fit over the hub in a perpendicular plane with the axle. This insures that your rear chain sprocket spins true with the rear bike wheel. *NOTE: On some older bike axle hubs like on coaster brake models it may be required to slightly enlarge the sprocket center hole to obtain a flush, and concentric fit next to the spokes. This is best done on an engine lathe by a professional machinist. . It is also recommended that the rear wheel be re-spoked to 12 to 14ga.
