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Will this mess up my transfercase?
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01-13-2012, 02:57 PM | #1 | |
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Will this mess up my transfercase?
I need to put snow tires on my Type 162 (Front: 18x8 ET34 225/40 R18) (Rear: 18x8.5 ET37 255/35 R18).
Car: 2007 335xi, sport package, 6speed According to Gary at TireRack I can run 225/40R18 all the way around. While I am sure he is correct and they will fit, will this damage my transfercase? My thought is that the rear tire will be slightly stretched on the rim causing a difference in diameter between the front and rear wheel. Quote:
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01-13-2012, 04:43 PM | #2 |
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According to the offset calculator at the top of the wheel and tire section, the difference in rolling diameter between your 255/35 series tire and a 225/40 series tire is 0.235%, so in that aspect you should be fine.
However, I don't know if I'd personally risk stretching a 225 series tire on a 18.5" rim. It will have a stretched look and provide less protection for the rim face. I use my stock rims (same sizes as yours) as my winter wheels, but my winter tires are 225 front and 255 rear. While it may not be the optimal size for snowy conditions, it still provides enough traction for safe driving. And there are only a few snowy days per year where I live anyway. The rest of the time it's just cold, so I prefer a staggered tire for more grip. Last edited by Patrick303; 01-14-2012 at 02:06 PM.. |
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01-14-2012, 10:01 AM | #3 | |
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Quote:
The rear tires will be slightly stretched, but it won't change the rolling diameter, only the width - which is good in this case since you want skinnier tires for snow. FWIW I'm running 225/40/18 Dunlop 3Ds on 8.5' wheels. The tires look slightly stretched, but not too bad. Just have to be careful around curbs etc. |
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01-14-2012, 02:57 PM | #5 | |
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This smaller rolling diameter is what worries me. Thoughts? |
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01-15-2012, 12:14 PM | #7 | |
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Quote:
I did have my transfer case replaced under warranty though... I hadn't thuoght stretching it would make enough of a diameter difference to matter. from .22, what's the worst it could have become, doubled to .44? Even still it'd be okay... The problem with my case wasn't a wear and tear issue though. I had a defect, at least they said. Interesting. |
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01-15-2012, 01:25 PM | #8 |
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I have 235/40/18's all around on my stock wheels with 10mm spacers in the rear and the car runs great.. my winter tires are Blizzak ws60's.. there is one thing that I have noticed is at high speeds when turning I feel a bit of vibration in the wheel, almost feels like torque steering.... The tires in the rear are a bit stretched but doesnt look bad at all.
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