0.25" larger in diameter than the stock swingarm pivot shaft. Self tapping. Solves the problem of damaged or stripped threads in the left side of 4-sp Big Twin frames. Oversized version of OEM 47510-58 pivot bolt. - Bad thread solution - self tapping +.025" oversize
Fits: > 58-84 4-speed Big Twin (Excl. Softail) (NU)
