I've had 19's for at least 2yrs now, and i found them to be pretty much hassle free. Basically, the rolling diametre is only 1" bigger than the 18" rims, thus the 19" rims have the same amount of rubber as the 18" rim. What i have discovered though, is that you use more fuel with the 19", about 50km less per tank. I would also only use; f:235 and R:255, depending on your rim width.