S&S Cycle SS560-0241 Inner Primary Bearing Race for Big Twin 08-UpThe tendency of the stock inner primary bearing race on late model big twins to shift on the transmission mainshaft under high torque loads, also known as walking of the race, can cause destruction of the transmission mainshaft seal, and ultimately the mainshaft seal, output gear and output gear bearing. The S&S inner primary bearing race features an extra step on the inside diameter that acts as a stop on the transmission mainshaft. When the race is