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Adjust wheel arch when not using standard tyres

1540 Views 2 Replies 3 Participants Last post by  Teutonaddict
Beware, if you've not installed the standard tyres on your M5 in the back (that are Michelin Pilot Sport or Dunlop SP 8080), you'll experience tyre touching the rear arch when people seating in the rear and trunk loaded, on bad roads.
I've Bridgestone S-02 installed and had the left rear tyre well damaged by some touch !
A specialist told me that, especially the Bridgestone tyres, are larger than other for the same official size (275), a difference of les than 1 cm is enough to be a dangerous problem.

So check you've the right rear arch adjustment done according to your tyres !
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I ran into the same problem on my previous ride, an E39 98 540 six-speed. When I switched from 245/40-18 BFG Comp T/A ZRs to g-Force KDs in the EXACT SAME SIZE, I ran into fender clearance problems. (This was the last model year prior to the staggered OEM set-up). Apparently, even within the same brand, there are differences in sidewall 'height' and stiffness that will have an impact when it comes to fender clearance. I opted to have the fenders rolled slightly at a body shop. BTW, my Service Tech said some suspension settling is common, and could have contributed to the condition. Needless to say, I didn't expect this problem when I switched tire models of the same variety!
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