Quote:
Originally Posted by ASAP
I apologize for asking a redundant question but...
Apex EC7 with 1 series offsets... 235 PSS front / 265 PSS rear on koni yellows.
Will there be any fitment or rubbing problems? Stock control arms but I can get alignment with max neg camber if need be.
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For our EC-7'ss in 18x8.5" ET45 and 18x9.5" ET58 for the 1-series, we do recommend the 235/40/18 and 265/35/18 tire sizes for street tires, which is what your Michelin Pilot Super Sports are considered. The 235/40/18 street tires are generally a direct fitment for the front of a stock car, and are a great improvement in width and grip over the stock 215/40/18 front tire size. Not all 235/40/18 tires will fit., as R-compounds, slicks and some other tires may touch the strut tube, requiring a spacer to fit. This fitment is tight on both the strut tube side and on the fender side, so there is little room to play with on a stock car. If a 3-5mm spacer is used to clear the strut tube with some tires, then it would be ideal to dial in some negative camber into the front suspension to help clear the fender. The 235/40/18 tires are tall and could potentially rub the plastic inner fender liner if the car is out of OEM alignment specifications. Plastic liner rubbing is usually considered acceptable by most owners, but it is something to look out for as the gills in the liner for the oil cooler can some times stick out towards the tire more than normal. The rear 265/35/18 is a direct fitment on the 18x9.5” ET58 wheel. There is no need to roll or run additional negative camber for this tire size on this wheel.
If you would like a wider front tire, you would need to make some modifications to your 1-series in order to accommodate them. If a tire that is wider than 235/40/18 is being used, at least a 3mm wheel spacer must also be installed, otherwise the tire will start rubbing the strut or spring perch. The 245/35/18 tire size would require either M3 front lower control arms, or camber plates, in order to achieve negative camber in the front due to how close the wheel and tire is in relation to the fender. For the 255/35/18 tire size, both the camber plates and the M3 front lower control arms are required to achieve enough negative camber in front in order for the front tires to clear the fenders. With coilover setups utilizing a cone shaped progressive front spring (KW, ST, or PSS9) a 235/40/18 tire is the maximum front tire width because the spring takes up too much room on the strut side creating rubbing issues once a wider tire is used.