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Old 04-18-2005, 02:02 PM   #1
WRXinEffect
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Default Is it okay to mount 235/40/17 tire on a 17/7.5 wheel??

Is it a bad idea to go beyond 225/45/17 for the stock 04 STi bbs wheel? I have a buddy who ran 23540/17s on the stockers and swore by it, but from everywhere I look it appears that tirerack, etc. warn against this set up... I would think that they'd be a bit loose???
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Last edited by WRXinEffect; 04-18-2005 at 02:12 PM. Reason: detail
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Old 04-18-2005, 02:53 PM   #2
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loose?? I think you mean tight! I have a buddy who squeezed 245/45/17 onto those rims, so you should be fine.
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Old 04-18-2005, 03:11 PM   #3
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Depends on the manufacturer's specifications for minimum rim width. This will vary by tire type.

I'm not an expert, but I see it as a long term wear / safety issue. If you go under the specified rim width for a particular tire, then you are changing the flex point in the sidewall to a location that might be outside the manufacturer's intended flex area. This may negatively affect tire wear, and even the ability to maintain the bead.

I ran 235/40/17 on a 17x7.0 rim for 9 months. The manufacturer's minimum width on that tire was 8.0 inches. I was fine in the sense that I never lost a bead or had a blowout. But the problem is, everything will be fine until you actually have a problem. The last thing I want to take a chance on is loosing a tire bead on an off-ramp curve at 50 or 60 mph.

So... I'm still running my winter tires, and am going to say good-bye to my expensive 235 / 40 / 17s. Could I continue to run them without a problem? Maybe, but I just don't want to take the chance, being a full 1" outside of spec.
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Old 04-18-2005, 03:56 PM   #4
mistaboosta
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I have the 7" wheels as well (Superleggera 7"x17"), would it be risky to use 225 / 40 / 17 tires on them?
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Old 04-18-2005, 05:11 PM   #5
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235/40/17 on 17x7.5 is done alot...you won't have any issues.


mista - Did you mean 225/45 or 225/40? A 225/45 is just fine on a 7" rim. I couldn't find any 40 series to see what they specify for rim width.

You can fit a tire on a narrower rim than recommended. Usually you will give up feel, lateral grip, and wear. Whether or not you give up enough to make the tire perform worse than a properly sized tire would depends on the tire and your driving style.
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Old 04-24-2005, 05:41 PM   #6
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yeah i mean 225/45 my bad sorry guys.

So 7" is no narrow for 225. that's nice than.
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Old 04-25-2005, 12:27 PM   #7
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any chance someone could post a pic of some 235/45/17 on a 17"x7.5" rim? i'm curious exactly how much the overhang is. i'd liek to go with something a little wider then my 225's to help avoid curb rash and such on the rims. would 1/2" over the rim cause any major wear problems on the tire?
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Old 04-25-2005, 12:33 PM   #8
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Every tire has a different width - for instance, a 225 Falken Azeni may be wider than some 235's, so how much "overhang" you have will depend on which tire you buy.
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Old 04-25-2005, 12:37 PM   #9
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What tire?

Different tires run different widths, even in the same size. For example, in 225/45/17, Potenza RE-070's are wider than Falken Azenis Sports which are wider than Hankook RS-2.

fyi, 7.5" rim is in the recommended range for most 235/45/17 tires.
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Old 04-25-2005, 11:40 PM   #10
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I would say for the most part you can even fit a 245 on a 7.5 rim. Ive seen it done. Im sure you would be safe with a 235 in pretty much any tire you would want.
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Old 04-26-2005, 12:32 AM   #11
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We fit 235/45/17 Hankook RS-2's on an Rota Torque 17x7.5 with absolutely no problem - zero overhang, looks great!. The Hankook's run a "true" 235, while the Falken's and Kumho's tend to run wider than advertised!!
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Old 04-27-2005, 12:11 AM   #12
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Quote:
Originally Posted by RogersWRX
We fit 235/45/17 Hankook RS-2's on an Rota Torque 17x7.5 with absolutely no problem - zero overhang, looks great!. The Hankook's run a "true" 235, while the Falken's and Kumho's tend to run wider than advertised!!
235/40/17 I think you wanted to say..

I want to do the same on 17x7.5 Enkei RPF-1 wheels. Any pictures of them mounted on your Torques?
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Old 04-27-2005, 07:24 PM   #13
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Subydude.com has those pics.
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Old 04-27-2005, 08:15 PM   #14
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correct.. 235/40/17 in the Hankooks S-R2

here are 235/45/17 in Kumho MX's


(please excuse my crappy camera phone pics! ; )

Also.. 225/45/17 in Falken Azenis 615's... can't see the rim as well in this shot.. All on 17x7.5 Rota's
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Old 04-27-2005, 09:02 PM   #15
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Very nice. Thank you for the pics!
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Old 04-28-2005, 10:05 AM   #16
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wow...i like those hankooks. thanks for the pics!
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Old 05-23-2005, 11:50 PM   #17
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Just what I was looking for, looks like im going with 235/40 Hankooks RS-2s on my stockers. Thanks for the pics Roger.
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Old 05-30-2005, 08:56 AM   #18
ka mano
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Default a relevant thread: '235 40 17 Owners'

http://forums.nasioc.com/forums/showthread.php?t=343100

twotacosfor99cents has a nice photo in post #7.
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