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Old 02-10-2006, 05:17 PM   #1
fletch
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Wheel offset question

i heard FR(RWD) car like BMW is better to use low offset(Deep dish) wheel to get better handle and better ride, is this true?

and i also heard there is a perfect offset on different width of wheel? so is there a best offset on our BMWs?
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Old 02-10-2006, 05:26 PM   #2
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The M3 uses a low offset out back. Offsets are not general, you need to be specific for what car you have, suspension and so on.
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Old 02-10-2006, 11:41 PM   #3
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Offsets have nothing to do with the fact that BMW's are front engine/rwd. It mostly has to do with suspension geometry, and the cars dimensions. Pushing the hubs out further to the width of the car allows for longer suspension arms/linkages, which allow for a more linear wheel path under suspension movement. By pushing out the hubs further you need a higher offset wheel to keep the wheels under the fenders. With the e46 M3 and ZM3 the rear fenders are wider, so a lower offset can be used. A high offset is important to prevent bump steer. You basically want the front ball joint to be placed at the centerline of the front wheel, so when you turn the steering wheels, the wheels are pivoting centered on the ball joints axis, as opposed to arcing. E28, E34, I think E32 and other larger cars have a lower offset wheel, but the front wheels pivot on a 'virtual pivot point' using two closely placed lower ball joints with the machpherson strut, so they still pivot along the centerline of the wheel.

Also, as a note, on most 3-series a lower offset with lead to a couple issues. You'll either rub the outer fender lip, need a lot of negative camber to compensate, and wear though suspension bushings and ball joints faster thanks to the added leverage the wheels are putting on the suspenion.
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Old 02-11-2006, 11:17 AM   #4
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sorry just new to bmw, so can you tell me what's the maximum offset that a e36 can go?
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Old 02-11-2006, 12:05 PM   #5
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Nothing to be sorry about.

The max and minimum offset has a lot of variables. Like how wide the rims/tires are,and how much you're going to drop your car. Generally you're looking in the 35-45mm range, but there are exceptions.
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