De-staggering wheels on CLK 350

My 2009 came fitted with 8.5 J x 17 x ET30 wheels rear & 7.5 J x 17 x ET36 wheels front. I wish to stay with 17" for reasons of comfort.
As others such as splinter have done on the W203 forum (C32) I would like to de-stagger my wheels & fit 8.5 J x 17 x ET30 wheels on the front as well. I would appreciate any experience you may have in this regard. The car will not be lowered.
The next question is regarding tyre size. At ET30 can one run 245/40/17 on the front? Experience with such fiddling on the W203 tells me that 235 is the largest one can go on the front at ET30 without touching the strut with OE struts. With Koni Yellow struts on a 203 that have a larger dimple you can JUST get away with 245 tyres without touching. What is the situation with tyre size on the CLK - 235 or 245 max on the front? I don't want to roll fenders.
Any advice would be much appreciated.
The CLK and C are very close to each other
My 8.5" are et32 with 235's and do not rub any where, but run very close to the strut.
In your case, it's not fender clearance as most as strut and wheel liner.

Mka77. Do you know what your tyre to strut clearance is at the closest point? I thought the fender would be OK. Just wanted some confirmaton of no touch at full lock going over a bump or through a depression. Thanks!
Last edited by Glyn M Ruck; Feb 2, 2012 at 05:53 PM.
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Verified an honest ~¼”/6mm during initial (static) mockup fitment. Noticed some missing paint on the Macpherson struts during subsequent inspections though.
No real damage of course, but that margin is a wee bit too thin for my liking.

Note the Michelin Pilot Super Sport tends to measure toward the wide end of the sizing spectrum for stated/claimed section widths.
Long ago gave up on the otherwise prudent fore-aft rotation regimen.



