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Old 07-31-2009, 04:12 PM   #1
300ZXNA
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Default 245/40/17 on a 2004 STi with coilovers

I have a 2004 STi with stock 7.5" wheels and whiteline coilovers set pretty close to stock height. Would 245/40/17's fit without any rubbing? I'm hoping to get a set of Dunlop Direzza Z1's so if anyone has any experience with them (I've heard they run wider than their rating suggests, so perhaps it wouldn't work). Anyway, all responses appreciated!
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Old 07-31-2009, 04:31 PM   #2
Yoo Shin
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Forget the rubbing issue, I wouldn't put a 245 on a 7.5, especially the Z1s which run wider then most 245s. Stick with a 225/45.

Well, let me ask this, what's the purpose, for autox? The width may help, but honestly you're wasting a lot of tire the 7.5" and it'll feel like slop. If you're really set on 245/40s, try going at least a 8" wide, but even then, IMO the response and feel will not be optimal.
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Old 07-31-2009, 04:33 PM   #3
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the tires would fit fine in the fender well but the rim should be 17x8 or preferably wider.
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Old 08-01-2009, 04:10 AM   #4
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Quote:
Originally Posted by Yoo Shin View Post
Forget the rubbing issue, I wouldn't put a 245 on a 7.5, especially the Z1s which run wider then most 245s. Stick with a 225/45.

Well, let me ask this, what's the purpose, for autox? The width may help, but honestly you're wasting a lot of tire the 7.5" and it'll feel like slop. If you're really set on 245/40s, try going at least a 8" wide, but even then, IMO the response and feel will not be optimal.
+1 agree
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Old 08-01-2009, 01:15 PM   #5
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Quote:
Originally Posted by 300ZXNA View Post
I have a 2004 STi with stock 7.5" wheels
no

too big of a tire

ya need at least an 8" wide wheel
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Old 08-02-2009, 12:51 AM   #6
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a friend of mine crammed 255's on an 8 inch wide rim. Not his smartest idea.
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Old 08-03-2009, 09:56 AM   #7
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Quote:
Originally Posted by Blackout33 View Post
a friend of mine crammed 255's on an 8 inch wide rim. Not his smartest idea.
245/40 on 7.5" wide is 28.6%
255/40 on 8.0" wide is 25.5%
20% is max for 40 sidewall generally

In other words, 245 on a 7.5" rim in 40 sidwall is substantially dumber than 255 on a 8.0" rim in 40 sidewall.
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