Subaru WRX Forum

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-   Wheels, Tires, Brakes, and Suspension (http://www.wrxtuners.com/forums/f139/)
-   -   St8 18x8.5 42 offset (http://www.wrxtuners.com/forums/f139/st8-18x8-5-42-offset-33605/)

06_hawk_eye 02-17-2013 10:50 AM

St8 18x8.5 42 offset
 
Was wondering what size tire everyone recommends on a 8.5 inch rim. Been lookin at 235/40/18 or something around that size. What's everyones opinion.

Thanks


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the RIOT act 02-17-2013 05:05 PM

St8 18x8.5 42 offset
 
I'd say you def wanna stick with a 245 at least. A 235 is too skinny IMHO unless you want a very slight stretch or something. A 245/40R18 would be a good option or a 255/35R18 would give you a nice squared looked.


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06_hawk_eye 02-17-2013 05:43 PM

St8 18x8.5 42 offset
 
Yeah I think I'll go with the 245/40 . I will be rolling all 4 fenders


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06_hawk_eye 02-17-2013 06:21 PM

St8 18x8.5 42 offset
 
1 Attachment(s)
[ATTACH]6071[/ATTACH]

There's a chart comparing a couple different tire sizes. 245/35 is pretty close stock size according to the chart. Again just don't like 3.4 inch sidewall


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pzr2874 02-17-2013 06:30 PM

I run a 235/40/18 on a 7.5 rim and that's the max. So a 245/40/18 will be fine for a 8.5

I wouldn't go to a 35 series tire.... especially with some tires having weak sidewalls

06_hawk_eye 02-18-2013 10:34 AM

St8 18x8.5 42 offset
 
The only thing I'm worried about is the 245/40 rubbing to much I will be rolling all 4 fenders do you think it won't run with a 245/40?


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06_hawk_eye 02-18-2013 10:39 AM

St8 18x8.5 42 offset
 
Rub**


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man show 02-18-2013 10:40 AM

I have 245/40 tires on my 17x9 +42 wheels. My fenders were rolled and pulled by IAG Performance and I have plenty of clearance and zero rubbing issues at stock height, so I think you'll probably be ok with that setup. Are you planning to do the fender work yourself?

06_hawk_eye 02-18-2013 11:17 AM

St8 18x8.5 42 offset
 
There's a guy in my area that works at a body shop and has a fender roller. so I'm gonna roll all 4 of my fenders and I guess go with 245/40/18 on mine and hope it doesn't rub since mine is lowered on gf210


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mosc 02-19-2013 04:11 PM

8.5" +42 with 245 tire? You'll rub on stock fenders. You won't rub if nobody's in the back and you drive on bump free roads but if the suspension compresses, the back fenders will eat your tire some. Roll would probably suffice.

06_hawk_eye 02-19-2013 05:41 PM

St8 18x8.5 42 offset
 
But a 235/40/18 will fit fine and I'll still roll fenders?


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mosc 02-21-2013 08:19 AM

you want shorter than 25", not taller. It'll help your gearing and also your clearance.

235/35R18 on 18x8.5" +42 is close. I'm not sure if it would require rear fender rolling or not. Probably matters on how much you care about the very occasional scrape when you hit a big bump, if you have lowering springs, and how often you put people in the back seat. Certainly with a rear fender roll you'd have zero issues... other than some serious steering response losses from +42 offset.

06_hawk_eye 02-21-2013 10:15 AM

St8 18x8.5 42 offset
 
I've owned the car for about 6 months and I haven't had 1 person in the back seat haha. The only prob with a 235/35/18 is I don't like the small sidewall. Already have a time set up to have all 4 fenders rolled. The 235/40/18 seemed like the perfect Candidate for tire size untill you mentioned about gearing


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mosc 02-21-2013 02:28 PM

If you want 40 sidewall and 235 wide but don't want to mess up your gearing, there's an easy solution: BUY 17" WHEELS!

Your stock size is 215/45R17. It's substantially less than 25". 235/40R18 is substantially more than 25". I would recommend a stock gearing or tighter. The 5-speed in your car is fairly tall. Smaller tires will help with low end pickup, reduce lag, and increase overall acceleration. It's an AWD car with fairly moderate HP, you don't need to worry about spinning tires. You also don't need to worry about cutting top speed as 5th goes on your stock gearing to well over the aerodynamic limit of your car (160+ if I recall correctly). In other words, lowering your gearing is a no brainer for any analysis beyond "the look". Now, I wouldn't drop below 24" or so, that's going to be too far out of factory spec and will cause other issues (changes in suspension geometry, etc). But certainly you want to err on the side of shorter tires than purposely getting one a full inch taller than your stock tire.

Also, on a personal standpoint, I think people who have massive diameter wheels which show off tiny little brakes underneath them rather silly. The look of the brakes actually filling the wheel diameter (hence a functional purpose for the wheel diameter in the first place) really make a car look more sporty to me. Seriously, you don't see anything weird looking at the rear of a WRX with 18" wheels on that are a full 3" from the brake caliber? The 06 WRX has nice front brakes which require special 15" wheels to clear. 16" is easier and still fills out the wheel. 17" is at least reasonable looking. 18" makes even your front brakes (which are bigger than 02-05 and 08+ wrx to be fair) look tiny.


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