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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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Ever since I supercharged my si, I need more grip. Been doing alot of research, and decided to go with a 17" rim vs the stock 18" (slightly better weight savings and cost). I'm not looking at rolling and/or pulling fenders.

I'm looking at Enkei TS-10 and/or TS9 both at 17x8 +45mm matched with Continental Extreme Contacts or Michelin Pilot Sport 4S

A few questions:

Will they clear Wilwood 4 piston BBK?
Which tire combo should I get for max performance: 225/45/17 or 235/45/17?
 

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Hey looking for wheel gurus... owned my civic for 3 years now, 2015 hfp coupe. I have put work into motor and performance but neglected wheel and suspension setup.
I currently sit at 260whp NA and will be more soon with future goals of supercharging in the 400fwhp area.
I would like a meaty flushish setup in the 245 -255 width area and currently have the 18x7.5 hfp rims but planning on going 17x8.5-9. Looking for wheel/suspension and rubber suggestions. I just want to hook up in first and second and look good lol.
Budget 3-4 Canadian max
 

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Hey looking for wheel gurus... owned my civic for 3 years now, 2015 hfp coupe. I have put work into motor and performance but neglected wheel and suspension setup.
I currently sit at 260whp NA and will be more soon with future goals of supercharging in the 400fwhp area.
I would like a meaty flushish setup in the 245 -255 width area and currently have the 18x7.5 hfp rims but planning on going 17x8.5-9. Looking for wheel/suspension and rubber suggestions. I just want to hook up in first and second and look good lol.
Budget 3-4 Canadian max
Is this also your daily driver if so you'll need a setup that is more practical rather than hardcore.
 

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Definitely read through this thread, there are a few examples of 245/40/17. One user had a staggered track setup with 255/40 up front. Search for user @safe gabe
17x9 with a 35-45 offset should work. Just know you may need some camber and fender rolling. Also the front get very close to the strut with a high offset

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I'm running 17x9 +35 Kansei KNP with 225/45 Potenza s-04's. Currently lowered on h&r springs which is a 1.5" drop all around. Do not rub, no fender work. Waiting on my Fortune 500 coils to come in, might go a little lower to 1.75" but will more than likely need to roll fenders. Already have rear camber arms waiting to be installed once my coils arrive.
 

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I'm running 17x9 +35 Kansei KNP with 225/45 Potenza s-04's. Currently lowered on h&r springs which is a 1.5" drop all around. Do not rub, no fender work. Waiting on my Fortune 500 coils to come in, might go a little lower to 1.75" but will more than likely need to roll fenders. Already have rear camber arms waiting to be installed once my coils arrive.
You’ll clear easily, bend those tabs or mild roll and your golden. Don’t need much Camber in the rear to clear either
 

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I'm running 17x9 +35 Kansei KNP with 225/45 Potenza s-04's. Currently lowered on h&r springs which is a 1.5" drop all around. Do not rub, no fender work. Waiting on my Fortune 500 coils to come in, might go a little lower to 1.75" but will more than likely need to roll fenders. Already have rear camber arms waiting to be installed once my coils arrive.
225 is a little stretched on a 9" wheel but overall I think it's a good looking setup. The 45 sidewall definitely gives that meaty look.

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225 is a little stretched on a 9" wheel but overall I think it's a good looking setup. The 45 sidewall definitely gives that meaty look.

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Yeah I was looking for a 235/40 but the tires I were looking at didn't come in that size for 17" and I'm not sure if 245/40 would fit or rub if I go a little lower.
 
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