I have a 999r and dropped one tooth in the front. At the same time I added a 57mm Termi system. I'll tell you, with the added power from the exhaust, the 14 in the front did nothing. I'm going up 2 in the rear. From what I'vre read over the years, and all the folks I talked to, the commom theme on 999's is one down in the front and two up in the rear...Seems to be the perfect set up for street. I tried to save a buck...