Regarding changes in wheel size and weight

Cpatel · 12-15-2018, 08:04 PM

I live around a lamborghini dealership and was window shopping yesterday evening and someone came in with a merci with aftermarket rims into the service station. the car reported malfunctions and damages to drivetrain and transmission. They immediately diagnosed it to the 20inch rims he had on it.

Does putting bigger and heavier wheels on a BMW do the same damage? What are the size and weight limits of the wheels? Does anyone have information on this?
I was thinking of putting on some 19 inch BBS rims and comparing it to the OEM (17 inch) wheels the car came with, its a considerable amount of weight added on.

ALSO. If you throw on larger wheels, wouldn't it affect the speedo and odometer? The readings would be incorrect.

Spielzeugauto · 12-15-2018, 11:00 PM

Wheel size has nothing to do with speedometer reading. That is solely determined by tire diameter, which you would select to be close to stock.

OEM wheels are usually heavier than aftermarket so that's rarely a problem either. Massively increasing the unsprung weight is not a good idea, but you'd really have to be trying.

12-15-2018, 08:04 PM	#1
Cpatel Private First Class 40 Rep 177 Posts Drives: N26 328i Join Date: Oct 2018 Location: USA iTrader: (0)	Regarding changes in wheel size and weight I live around a lamborghini dealership and was window shopping yesterday evening and someone came in with a merci with aftermarket rims into the service station. the car reported malfunctions and damages to drivetrain and transmission. They immediately diagnosed it to the 20inch rims he had on it. Does putting bigger and heavier wheels on a BMW do the same damage? What are the size and weight limits of the wheels? Does anyone have information on this? I was thinking of putting on some 19 inch BBS rims and comparing it to the OEM (17 inch) wheels the car came with, its a considerable amount of weight added on. ALSO. If you throw on larger wheels, wouldn't it affect the speedo and odometer? The readings would be incorrect.
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12-15-2018, 11:00 PM	#2
Spielzeugauto Private 66 Rep 80 Posts Drives: F31 Touring Join Date: Nov 2018 Location: Vancouver iTrader: (0)	Wheel size has nothing to do with speedometer reading. That is solely determined by tire diameter, which you would select to be close to stock. OEM wheels are usually heavier than aftermarket so that's rarely a problem either. Massively increasing the unsprung weight is not a good idea, but you'd really have to be trying.
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