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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Wheels and Tires Forum Sponsored by The Tire Rack > Transmission question...



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      12-29-2012, 04:18 PM   #1
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Transmission question...

Going from stock 17's which are a 45 (don't recall the width. I believe 225), to 285/30/20, does this really affect the transmission in a negative way? I'm aware of the speedometer readout error, but someone is telling me it stresses the transmission. To me it doesn't sound right. Yea, a bigger wheel and tire will add rotational mass, but so does adding passengers and/or cargo. Anyone want to chime in?
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      12-29-2012, 09:02 PM   #2
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Yea I''m no expert but I don't see how bigger tires would result in transmission stress. That doesn't make any sense.
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      12-31-2012, 07:04 AM   #3
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Not just tires, bigger wheels and tires.
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      12-31-2012, 02:04 PM   #4
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I was actually talking to a guy yesterday who owned a BMW too. He said the same thing to me since I have an XI. He said if you change the width of the tires it will screw up the all wheel drive on the car. I'm no expert in cars but that didn't make sense to me. Does anyone with XI can charm in too?
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