[lostinmysenses]

The wheels should be 18x7.5 +48 5x100 with a tire size of 215/40.

 

[lostinmysenses]

Thanks for the reply. Good thought there--go lighter with the 17s. I guess I was thinking 18s just because I have a set of good 18" tires, and I am just used to dealing with 18s. However, I shouldn't let one set of used tires set my agenda for what I hope will be more years of autocross. Time to start looking at 17s.

Awesome. That’s exactly what I meant.

Just keep in mind that the lowest offset we should be able to use is +42 and the width has to stay 7.5”, which I’m sure you’re probably already familiar with but just in case that helps. This is assuming you’ll be wanting to compete in the street class.

 

[lostinmysenses]

Thanks! This is the information I was looking for. I hope they are, indeed, 18 x 7.5. I have a set of 225/40 RE-71R tires that I used this past summer for autocross in my GTI, and they still have plenty of life in them. They fit nicely on 18 x 7.5 rims. I figure that if I manage to get my hands on a GR86 before the upcoming autocross season, I will get a spare set of lightweight 18" rims and slap these Bridgestone's on them. I guess even if the stock rims are not 7.5, it seems that a set of 18 x 7.5 with the proper offset should work.

Sounds good! That will definitely work. I’m not sure how familiar you are with the platform but in case you’re thinking of purchasing a nice set of wheels I would highly recommend going for 17s instead. If you have a spare set of 18s then you’re all good but just want to give you a heads up, especially if you’ll be autocrossing.

 

[lostinmysenses]

According to the spec sheet available on Subaru Canada's website the wheels are 18×7, not 7.5.

That might be a Canada specific thing or even a mistake in that case; the U.S. spec gets 7.5” wide wheels.