Quote:
Originally Posted by timurrrr
True, but on a BRZ/86, 9.5" doesn't actually let you put any wider tires? The geometry of the wheel arches and the suspension limit your choices wrt performance, not wheel width.
Having said that, 9.5" is probably going to mostly be just extra weight with no obvious performance benefit, and a bit too much stretch in case you decide to go back to 245/40R17.
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Even then, moving to a wider wheel while keeping the same size tire will have benefits up to a point. For instance: a 225 tire will be faster on a 9 inch wheel than an 8 inch wheel. This is because a minor amount of stretch artificially stiffens the sidewall. This allows you to run lower pressures without encountering tire rollover.
Lower pressure = greater contact patch area