Quote:
Originally Posted by BzsBimmer
Anyone run a 255/35-18 on a 9.5 and 275/35-18 on 10.5?
Better pricing on tires. Not a normal setup from what I see. Most people run 265/285 respectively.
Looking for feedback on a lot of street driving with a few track days to see how well that would handle.
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These tire sizes can certainly be used, but they are technically a little stretched for 9.5" and 10.5" wheels. This leaves the lip's of the wheels open for potential damage. The e9X has plenty of room under the fenders, so most owners choose to maximize tire width, resulting in more grip. The tire sizes you mention would be better suited with 18x9 and 18x10 wheels.
You also mentioned that your motivation would be to save money on tires. No doubt that tracking your car can get expensive, and the best way to save money on tires is to run a square fitment. The most common is 18x10et25 with 275/35/18 tires.
A square setup (same size wheel and tire on all four corners) has many benefits. First, it allows you to rotate your tires effectively from front to back, and/or side to side which has a major impact on tire longevity and promoting even tire wear. When running a square fitment, you typically have gained more front wheel/tire width over stock spec’s, and that creates more front end grip, as well as sharper turn-in. Overall a square setup is believed to create a much more balanced car for the corners. These benefits are very attractive for track enthusiasts and racers, but also translate to an everyday street car.
- Ryan