I just installed a set of Sport Classic II's on my 951. They look great, but I have some issues with the front wheels.

The fronts are 7.5" wide with ET50 offset. I've got 245/40ZR18's on there and needed to use a 1/4" spacer to get the wheels to mount correctly. The wheels are now flush with the outside of the fender and the fender rubs on the wheels when the suspension compresses.

Has anyone else mounted wheels like this to their 951? How did you solve the rubbing issue?

My fenders are already partially rolled, but it still rubs on the rolled lip. Any suggestions?

Thanks,
Nick

 

Cut off the fender lips and dial in more negative camber may be two options.

 

It seems to rub more when I'm turning hard and compress the suspension. When I'm turning like this, the wheel turns so it's outside the fender, so more negative camber won't make it rub less.

Has anyone else mounted tires this size on their 951?

 

The problem isn't the tire size, the problem is your 1/4" spacer changing whats probably about a 50mm offset to a ~43mm offset. This is the opposite of what you wanna do when you go to a wider wheel/tire. You typically want to increase offset to put more of the wheel/tire on the inside. Obviously, this is the direct opposite of what was done.

More negative camber will help because it will pull the top of the tire in further, similar to changing offset...but only effects the top of the tire. You can do some simple Trig to figure out how much varying degrees of camber will push the top of the tire inward...

When you go around a corner real hard, the ancient suspension design in our cars can actually cause positive camber if you're cornering hard enough with enough suspension travel. If its not extreme enough, all that will happen is that you will lose some/all of the negative camber that is dialed in to your suspension. Thus the top of the tire will be pushed outward as you go around a corner...

All of the above has been gone over in greater detail by Danno at some point in time