I have a 06 vulcan 500 time to change the drive sprockets was wondering if 17\40 sprockets held a big advantage over the stock 16/42 sprockets. I've had no issues with the stock setup. The bike is a daily commuter bike,40 miles one way, about 3\4 of the trip is 55 mph. I get about 50-55 mpg, and can keep up with traffic rather well (60-65mph). Was only wondering if changing the sprockets had any noticble advantage. Thanks for your help.