Main bearing, drive side

Crankshaft bearing D/S Ariel 200cc Colt, BSA Bantam (1948-71), C10/C11 (3&4 Speed), C12/C15/B40 Star/Sports, C25/B25 Ball race, Triumph TR25/TR25W 250cc (1967-)
Villiers 1H 225cc/2H 250cc.