I've been the other way with a 955 Tiger from a 19" to a 17" it transformed the bike with the way it speeded up the steering,you guys will get the opposite effect,Yamaha have got round it with a different head angle which you can't do,so you'll end up with a bike that steers like a wheel barrow,the only option is to raise the rear(alot) so you'll end up with a very tall bike.