BSA Pre-Unit Singles "Big End" Assembly (1) - B31 / B33 / M20 / M21 / Etc (PRE - 1959) Reprint Click here to purchase the

Click here to purchase the battery buckle

Fits the BSA A65 Lightning

Measures 54" in total length (end to end) suited for U

Fits BSA A50 & A65 models with the 8" Conical Steel Hub and WM2x19" rim (Lightning

New Triumph / BSA clutch and brake lever perches

BSA Pre-Unit Singles "Big End" Assembly (1) - B31 / B33 / M20 / M21 / Etc (PRE - 1959) Reprint Click here to purchase theWorn big end? Bottom end making a "knocking sound"? Chances are your big end is in need of replacement! Replace your big end with our new high quality English made complete big end assembly's. Comes included with pin, rollers, race, nuts, etc. threads are 3 4" OD Works with connecting rod part #'s: 66 483, 65 1614, 66 481. Fits all BSA pre unit singles (B31, B32, B33, M20, M21, M22, etc) from approx 1937 1958. Check your parts book to ensure the best