Collection: mainshafts for Harley-Davidson, Indian and Metric motorcycles

Every explosion, every push, every turn eventually meets at a single point and transforms into rotational motion – this is the crankshaft. The crankshaft is the mechanical heart of the engine: it converts the up-and-down motion of the pistons into rotational motion, which is then transmitted by the drivetrain to the rear wheel. This is one of the most heavily stressed components in the engine – every combustion stroke exerts immense force on it, so the balance, strength, and precise fit of the crankshaft fundamentally determine the engine's smoothness, reliability, and lifespan. In our selection, you will find crankshafts for Harley-Davidson, Indian, and metric custom motorcycles, ranging from OEM-spec replacement parts to larger-stroke, performance-enhancing stroker crankshafts that can increase both displacement and torque. Complete, pre-balanced units are available, as well as related components – bearings, seals, and fitting elements – making a complete engine overhaul straightforward. Quality crankshafts are manufactured with precision, from high-strength forged or cast steel, with careful balancing to ensure they rotate smoothly, without vibration, and reliably, even at high RPMs and under significant load. Whether replacing the crankshaft is part of an engine overhaul or the foundation of a serious stroker performance upgrade project, you will find the part that perfectly fits your engine and needs with us.