235/40/18 on 06 wagon - Subaru WRX Forum
 
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#1 Old 09-03-2008, 02:39 PM
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i want to run 235/40/18 on 18x8 rota wheels. 48mm offset. On an 06 wrx wagon with stock suspension. will it work with put rubbing or will i need to roll my fenders.
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#2 Old 09-03-2008, 04:47 PM
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I think it will work. i run 225/40/18 Rota Forumla Mesh. 48 Offset. And my WRX is lowered... It'll fit.
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#3 Old 09-03-2008, 05:09 PM
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225/40/18 should fit. 235s might rub, might not. Not really sure how much less room the wagon has. Just go with 225s, the extra 10mm isn't worth it. Your tires will be slightly too tall as well.

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#4 Old 09-05-2008, 03:57 PM
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Any one have that size rim and tire on their wagon?? Any feedback would be very appreciated.
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#5 Old 09-05-2008, 07:25 PM
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It's going to vary based on tire brand, suspension ware (even if they're both stock) and wheel offset so even if other ppl are running that size, that doesn't mean it will work fine for you.

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#6 Old 09-06-2008, 09:37 AM
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It'll fit, I work at a tire company and have put 235's on a WRX wagon before and it fit fine, also had 235's on my 02' WRX and didnt have any problems and its lowered with the Eibach Pro Kit
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#7 Old 10-07-2008, 04:01 PM
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I have 225/40/18 with Rota tarmac3 18x8 on my 06 wrx wagon. It fits but it rubbed stock with just the wheels (not lowered), in extreme cornering. I now have swift springs running the same wheels, with rear fenders rolled,and It rubs occasionally during very very extreme cornering, but will rub if I have a heavy load in the rear, 2 people + subwoofer. There is way less clearance in the rear wells than a sedan.

If you go with this setup expect to upgrade your suspension, if you stiffen it up, it shouldn't rub at all. I'm in the process of deciding between kyb agx or koni inserts.

good luck
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#8 Old 10-07-2008, 08:07 PM
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Since the topic is up i have 2 questions. 1st how do you determine if you need new tires? I went by a tire shop today and they said i have 4/32 seconds left on my tires which could be worn down in ahundred miles or 1000 miles. 2nd question I have a 2005 9-2X and was hoping to put 225 50 16 on to my stock rims. Do you think this will be a problem. I know that 205 55 16 are standard. I know that they drop the meat of the tire to compensate for abs. So is 225 to wide or should I just go with 215? FYI Bridgestone Potenza RE 960 AS PP. Thanks for your help.
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#9 Old 10-07-2008, 10:33 PM
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You shouldn't pick a tire size that's more than 25% wider than your rim. Not sure if your rims are 6.5" (05 WRX) or 7.0" though, they could be different. Here's a chart I made for tire widths based on rim width:

6.5" width rim: 185 to 215 tire width
7.0" width rim: 195 to 225 tire width
7.5" width rim: 205 to 235 tire width
8.0" width rim: 225 to 255 tire width
8.5" width rim: 235 to 265 tire width

You need new tires when the tread depth starts to get low. There is no set number, that matters greatly on the type of tire it is. A UHP summer-only tire can run with much less tread than, say, a winter tire. 4/32 is the standard minimum for inspections and it represents a good number for all season tires but really if you want good winter handling, you aught to have more and similarly if you are in the heat of the summer, you can get away with a 32nd or two more wear before getting rid of them.

A tire would be "dead" approximately (mostly pulled out of my ass)
Summer Only: 2/32
All Season: 4/32
Winter: 6/32

A note though that wet handling on some tires is not a problem at low tread depths and other it's a huge deal. Hydroplaning resistance is especially critical as you increase tire width and it is directly linked to tread depth HOWEVER! The layout of the tread matters a great deal. If you take a winter tire and run it down to 2/32, it's not going to push water to the sides very well but something like a KDW2's tread would probably still work decently.

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