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Diffrerence between 245/45/17 and 245/40/17? I know... profile...

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Old 09-03-2008, 11:01 AM
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Default Diffrerence between 245/45/17 and 245/40/17? I know... profile...
but S-ingTFA, I saw people recommending 8"-8.5" wheels for 245/40/17.

I have 245/45s on my car now, no issues. Why would a 40 series call for a wider wheel? Same width only a smaller profile and diameter.

I'll give that the 245/45s are pretty close to the suspension and maybe the 245/40s would need a different offset to clear.

Nevermind the speedometer... I could use the smaller diameter on a track car.
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Old 09-03-2008, 11:35 AM
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I don't understand why changing only the aspect would necessitate a change in wheel width
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Old 09-03-2008, 12:00 PM
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I don't know either. I'm stumped why there was a consensus on wider wheels.
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Old 09-03-2008, 01:47 PM
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Default I agree with Matt Devo, there is no rim width change required for only a change of the sidewall ..
dimension, or aspect ratio given the same tread width. It does not compute.
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Old 09-03-2008, 02:27 PM
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You can look up the recommended rim widths on any tire manufacturer's website
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Old 09-03-2008, 08:14 PM
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the stretch, some tires require more stretch at lower profile
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Old 09-04-2008, 04:39 AM
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Tires.com only gives the 45 as a +0 upgrade. Screw it. I'm buying tires.
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Old 09-04-2008, 09:00 AM
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Default I think those are common combos
I run 235 35 19 on a 19 x 8.5 wheel for clearance and stretched tire look. Def not recommended size for whee. Plus tread can vary from tire brandsl
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Old 09-05-2008, 06:38 AM
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I stuffed 255/40/17 on my SL track wheels. No rubbing. They don't stick out either.
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Old 09-05-2008, 10:51 AM
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What size are you track wheels?
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