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G37x tire/wheel fitment 245/45-19

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Old 09-19-2018, 09:43 AM
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EXTREMEFUN1300
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G37x tire/wheel fitment 245/45-19

Does anybody have first hand experience with a 245/45-19 on a 8.5" wide +35 offset wheel?
I'm not lowing my car, but would like to take up a little gap when I put 19" wheels on. Most 245/45-19's are less than an inch larger overall diameter than the stock 225/55-17 with a crap-ton of gap.
I understand speed'O vs real mph will be off.
My wish is to have a flush'ish look, a little less gap and my obvious concern is interference ANYPLACE.

Any input is appreciated, thank you
Matt
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Old 09-19-2018, 01:13 PM
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The ECU apparently has a limit on how much change it accept in rolling diameter. Everyone sez 3%. That's on top of the transfer case limitation of @1% front-to-rear. There are tons of tire calculators on the Interwebs, including this very site.
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Old 09-19-2018, 04:28 PM
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I've always been curious about that - and I don't quite understand why everyone says a 3% variance from stock will cause issues. Going up in size (or down) on all 4 corners is functionally a gearing change, just at the tires. A 3% difference front-rear (even on a 2WD car) makes sense, due to differences in rotational speed (and sensors deciding it's not a good thing), but not on all 4 corners.

So long as he remains the same at all 4 corners, I don't think - at stock height- he's going to have any issues at all (especially with a narrow-ish tire at 245). It's a 27.7 inch diameter tire, over the stock 26.7inch.
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Old 09-19-2018, 06:05 PM
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I'd rather not answer these kind of questions, just because there's not a definitive line that's been drawn. I'd hate to give it a green light then you end up having some issue down the road. 3% difference from OEM has been floating around the site since before I've been here, and while it's hard to pin down evidence that this will create problems I'd tend to stick w/ that figure. Theoretically like Chaos mentioned, it shouldn't cause problems since it is a square setup but w/ all the sensors that are tied together to the traction control, ABS, and other drive systems it's ???.
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Old 09-19-2018, 06:34 PM
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Originally Posted by bPChaos View Post
I've always been curious about that - and I don't quite understand why everyone says a 3% variance from stock will cause issues. Going up in size (or down) on all 4 corners is functionally a gearing change, just at the tires. A 3% difference front-rear (even on a 2WD car) makes sense, due to differences in rotational speed (and sensors deciding it's not a good thing), but not on all 4 corners.

So long as he remains the same at all 4 corners, I don't think - at stock height- he's going to have any issues at all (especially with a narrow-ish tire at 245). It's a 27.7 inch diameter tire, over the stock 26.7inch.

That was my thought exactly, the ECM should only see it as increased wheel speed, the same increased wheel speed in all four corners as well as slippage front to rear side to side and upside down! LOL It doesn't know if the cars traveling faster or if the tires are taller.
IF the 3% rule applies, for whatever debatable reason, I'd still be within tolerance going from 225/55 to 245/45, on the high limit but still < 3%. The 1% rule shouldn't apply with a square setup.

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Old 09-19-2018, 06:40 PM
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Originally Posted by blnewt View Post
I'd rather not answer these kind of questions, just because there's not a definitive line that's been drawn. I'd hate to give it a green light then you end up having some issue down the road. 3% difference from OEM has been floating around the site since before I've been here, and while it's hard to pin down evidence that this will create problems I'd tend to stick w/ that figure. Theoretically like Chaos mentioned, it shouldn't cause problems since it is a square setup but w/ all the sensors that are tied together to the traction control, ABS, and other drive systems it's ???.
I'm with you, I'd be hesitant to say 100% there wouldn't be any issue as well. Staying at stock ride height I don't see clearance issues honestly, but would be an expensive mistake if I bought everything, put it on and there was!
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