One of the most popular modifications are aftermarket wheel. Yet, choosing the right sized wheels can be tricky since there are many of dimensions and offsets to choose from. So in this article I will explain everything needed in order to get a flush fit with your FRS, BRZ, or 86.
First, let’s cover Offset. Offset is the distance from the centerline of the wheel to the back side of the hub mounting face. This is measured in millimeters and determines how far the wheel pokes out when it’s bolted to the car. A higher offset like a +55mm will scoot the wheel inwards towards the suspension, while a lower offset like a +35mm will push the wheel out away from the suspension. A 9.5in wide wheel with anything lower than a +35mm offset will poke out past the fender.
A wider wheel gives a more aggressive stance and increases handling since it can fit a wider tire. But a wider wheel will need a lower offset in order to clear the factory strut. We typically run a 9.5in wide wheel with a +38mm offset. With that said, if you’re still on stock struts, there are a couple fitment issues to note. The popular 17×9 wheel will hit the factory spring perch with a +45mm offset, so a +35mm offset is needed instead. And inorder to fit 18×9.5 +38 wheels, a skinnier 245/35/18 tire is needed to clear the OEM suspension.
The widest tire we recommend for a 9.5in wide wheel is a 255/35. If you’re able to dial in some negative camber, it’s possible to fit a wider 265/35 tire. Which is a great option for any turbo/supercharged cars out there, to help get that that power down to the ground.
With wider wheels, the tires are going to be a lot closer to the fenders. So instead of cutting or rolling the fender for clearance, a few degrees of negative camber will help tuck the wheel inside for better clearance.
Camber plates will allow you to achieve this up front, but adding negative camber to the rear wheels is a different story, because you’ll the a set of adjustable lower control arms. These use a turn buckle and lock system to vary the length of the control arm, adding or subtracting negative camber. But when you start adding negative camber to the rear on these cars, it also affects the toe alignment. So we highly recommend adding these adjustable toe-arms to get a proper alignment.
The last thing to keep in mind before you buy a new set of wheels is spoke design. Most wheels with fit right over the factory brake calipers, but if you plan to upgrade to a big brake kit in the future, you’ll need to make sure there will be at least 3mm of clearance.
Hopefully this has given you a better understanding of wheel fitment. If you have any specific questions, feel free to send an email to Sales@FT86SpeedFactory.com.