[Tesh323]

I have the M68 wheels, 7.5 fronts, 8.5 rears... all are wearing 225/45/17 Bridgestone rubber with no problems... Ideally, to protect the rim better, you can get 245/40/17 on rears... but 225/45/17 is totally fine.... I have no problems at the moment

BTW - M68 is a very nice rim !!!