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I need to amend my comment a bit. Since the 2015 came with 225/40/18, 235 is only 1.25% taller.
I always think back to my 2012 with the smaller stock wheel.

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For me, I'm running the 2012 HFP suspension. For the 2012, I believe 235/40R18 is 3.3% taller than the 215/45R17 tire that I'm going with and also 2 cm wider.

From factory my new setup will be on a rim that I think is 1" wider (17x8 vs 18x7) and the offset is 1 cm pushed out (+35mm vs +45mm). I really hope I don't have issues without having to roll fenders.

I should mention I'm getting the Avid.1 AV20 in bronze 17x8 +35mm! That's why I was asking what you were running, dpetro, and hoping you weren't having issues. You still running that set-up?
 

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I should mention I'm getting the Avid.1 AV20 in bronze 17x8 +35mm! That's why I was asking what you were running, dpetro, and hoping you weren't having issues. You still running that set-up?
I no longer have a 9th gen. Driving a WRX now.


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Looks good ! Picked up of the same rim with 235 45r17 federal snows. Going to run them for this winter. In the spring I'm going to switch to all seasons but the size is the question .
Have been waffling between 235 45 's & 225 45's. The issues I have are :
Tire stretch with the 225's
Speed correction with the slightly larger rolling dia of the 235's.
Thanks for your thoughts
 

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Looks good ! Picked up of the same rim with 235 45r17 federal snows. Going to run them for this winter. In the spring I'm going to switch to all seasons but the size is the question .
Have been waffling between 235 45 's & 225 45's. The issues I have are :
Tire stretch with the 225's
Speed correction with the slightly larger rolling dia of the 235's.
Thanks for your thoughts
I've got 235-45-17 Continental extreme contacts, and the speedometer now matches GPS (maintained on level surface over time).
There's tire size and speed calculators online, I suggest doing a gps speed vs speedometer difference, then the math for the tires.
I had known bikes were not accurate at speed. I hadn't thought about why it's a good idea for a car to be going a lower speed than shown.
IF YOU HAVE A HEAVY FOOT IGNORE THIS.
 
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