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Hi Guys,
I'm struggling with almost the same issue.
I'm also with an M140i, M-Performance diff and Ohlins coilovers on the way.
I'm interested in a more competitive tire setup, but my limitation is that the maximum tire width is 245. If i go with 255 i get bumped up in category (i compete in a local time attack), and i want to stay in the current category.
The problem i found, is that the original 245/35 rear tire size, doesn't have good tires available, the maximum i know of is the pss, i would like something like the pilot cup 2 which doesn't come in 245/35/18.
I also have a limitation on Tread wear (it has to be above 100, so r888r is not an option).
I think a square 245 setup would be good, but then i'll have to go with 245/40? Is that something that was tried and works well?
The other question is, what rim width and offset do i need?
From the answers here i'm not totally sure i need spacers or not, will front 8.5 et35 work with 245 width?
Any suggestions would be very appreciated.
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