Got the Sixty-5 back on the road with a 19 tooth sprocket. REALLY like it @ cruise speeds. lost a little acceleration but for me a welcome trade off for a more comfortable cruise. No problems with the fit, was able to use the original chain as it had 2500 miles of wear on it. Works great with my 5-speed in the mountains. Only mods are classic exhaust, K&N filter, heavy duty clutch springs & high test gas.