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uh... what? (archive)

[ Follow Ups ] [ 5-series (E28) Message Board ] [ Msg. Board FAQ ]

Posted by Rob Levinson on June 16, 1999 at 20:09:32:

In Reply to: Info on new wheels and more posted by Gregory Fields on June 16, 1999 at 19:34:41:

The wheels that I used were off a E39, thats right a E39. The use of these wheels allowed for a greater selection of factory styles.
E39 wheels are not hubcentric on an E28... did you get hub adapters or are you relying on the bolts to keep the wheels centered?

I choose a 15" size because the car is going to sit lower to the ground and I did not want to tires to rub.

Uh... what?

What does the wheel diameter have to do with the height of the car or tire rubbing? It's the width of the tire and the offset of the wheel that are the main elements that affect tire rubbing. Very rarely does rim width factor in to that, unless the rims are so wide that they pull the sidewalls near the tread further out than a correct-size wheel. If you used a 15x7 wheel with 225/50-15 (which incidentally will make your speedometer read almost 4% too fast), you could also have used a 16x8 with 225/50-16 tires with only a 1/4" greater radius that would not have caused any rubbing. Also, the 225/50-16 size would come very close to giving you correct speedometer calibration.

So I'm still unclear about what you thought you'd achieve with that wheel size. Unless your car is so radically lowered (greater than 2"-4"), you won't even encounter tire rubbing with a 225/40-17 wheel/tire combo.

- Rob

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