I immediately noticed some loss of quickness in fast take offs but hated looking for a 6th gear. No doubt either is a compromise. But with better exhausts larger mains/jets and less restritive filter, the bike handles the higher ratio fine. I don't think it would be smart to go up from 17T with a stock bike. I need to ride more to get the feel but I think the 18 will be the best comprise for me. The added plus is better gas mileage - especially for highway riding.
