I was told by a riding partner that you could change the rear drive pully , install a narrow belt , and the bigger tire would work . I can´t verify this , but you could check with your local dealership and get their opion on this . Hope this works out for you . If you know of anyone looking for a 2003 silver and black anniversary model , I have one . I bought it new in April of 03 , no one has ever ridden it but me . I´m 52 and have been riding since I was 14 . The bike has been well taken care of , just serviced out , all fluids changed , and 2 new tires mounted and balanced at dealership . I´m asking $12,500 , if you know anyone that might be interested , they can reach me at metemple55@yahoo.com