SKU: MRE1300-610-269

Replacing the 1st driven gear only with the Robinson industries 1st gear will lower the ratio from 2.61:1 to 2.69:1, allowing you to run a tall enough final drive so it does not hit the rev limiter before the end of the quarter mile. A must for those who want to get the lowest E.T. and best M.P.H. out of their Hayabusa.