Mainshafts

21 products

Mainshafts for Harley-Davidson covers the primary output shafts within the gearbox that transfer power from the transmission to the final drive. A worn or damaged mainshaft leads to gear engagement problems and excessive play, making timely replacement essential for reliable shifting. Supplied through Iron City Motorcycles, an authorised Harley-Davidson dealer, this range features products from Andrews, MCS and Jims. Whether you are rebuilding a four-speed on a Shovelhead, a five-speed on an Evolution Big Twin or a six-speed on a late-model Touring machine, you will find mainshafts manufactured to exacting tolerances. Each shaft is heat-treated and precision-ground to deliver long service life under demanding conditions. Browse the full range below.