[dradernh]

Originally Posted by ifobd

I picked up a set of forged apex 17x9 et42 for doing autox and hpdes. Havent picked a tire yet, but Im really leaning towards putting on yoko advan a052s as others seem to really like the performance and they are the spec tire in global time attack. Question, has anyone run 255/40 in these tires on 17x9s, if so any fitment issues?
17 M240i xdrive. Dinan springs.

The section and tread widths of that tire are 10.2" and 9.4". I've run a 9.2" tread-width 255/40-17 Toyo R888R at the track. Tire Rack doesn't list a section width for that tire. They're on Apex 17X9 ET42 wheels in the front. To fit them, the camber is -2.6° and the fenders are slightly rolled. The car has no spacers in front. I was told that they'd rub the fender liners, but that hasn't happened.

The last thing to know is that I'm running TC Kline single-adjustable coilovers in front. I recently saw two lists of coilovers. I don't recall if they were specific to the 2 Series or not, but the coilovers on one list offered a reduced amount of space available for the tires. IIRC, as an example, KWs were on that list; the Koni-based TCKs were on the list of coilovers that didn't impinge as much on space available for the tires.

I'm no expert in these matters, turning it all over to shops and just writing the checks, but I'm guessing the difference was how much the height-adjusters stick out at the bottom of the strut bodies. I haven't measured how close the tires sit to the strut, but they can be quite close without it being an issue.

I'm not sure how much that helps given that you've got an xDrive and, I'm guessing, no camber plates.

I'm running 255/35-18s in the rear. Again, no section width data but the tread width is 9.3". There's a lot more room back there; I think the principal fitment issue for wide and square tires is in the front.