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Re: Newbie - tire width on '88 750 iL? (archive)

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Posted by guy simpson on December 28, 2000 at 04:20:46:

In Reply to: Newbie - tire width on '88 750 iL? posted by RobWilson on December 28, 2000 at 01:27:50:

Congratulations on your new car. The correct rolling diameter for this car is 25.5". Since your wheels are 1" larger than original your sidewall profile at 16" would drop from 60 to 50 to keep your rolling diameter the same. However due to manufacuring differences between manufacturers of the same tire dimension you should measure the car with the tires on it and see how close you are to 25.5" and take into account tire wear. IE Michelin Pilot sports tend to run 5-10mm wider than Yokohama AVS sports while they both have the same dimension. Unless your wheel width is greater than the stock 7" wide then 225 is going to be the best match. You can do pretty much anything you want with tire wheel combinations up to 10" wide wheels rear and 9" wide fronts with special offsets. I'm running 235/35/19 and 275/30/19 but when these wear out I'm going to 245F and 285R as my wheels show a bit more than I like.

As for the ground effects, you should post a picture. High quality ground effects are hard to come by. Of all the german tuners only Racing Dynamics supports this car, but they are now only selling remaining stock on hand. I am still awaiting a email from them as we speak on if there are enough parts to do my car. The e32 is now 7 years old, and with the coming of the e65, there is virtually no demand for these kits.

Can't comment with certainty on your wheel upgrade. Are your cross spoke style by chance?

Guy Simpson
92 750iL's


I'm a newbie to the BMW world, but not to the car enthusiast world. I just bought an '88 750 iL yesterday with 138,000 miles. It needs a lot of little things repaired or replaced on it. One of the things it needs is a new set of tires. From what I've been able to tell, the stock tire size was 225/60/15. Currently, the car has BBS wheels with 225/50/16 tires. That means that the current tires are over .75 inches shorter than the stock tire height. Unless the original owner had the speedometer corrected to account for this tire height difference, the odometer shows more miles than the car has actually been driven. I would like to get back to the correct overall tire height. I would like to go with a wider tire at the same time. I'm considering mounting a 245/50/16 on these BBS rims. Can anyone tell me if this tire width will cause problems for me? Will I get tire rubbing? What is the widest recommended width that people are getting away with on these cars? Any help is greatly appreciated! I look forward to learning much more about my new (to me) 12 cylinder car. :)

BTW, the car has some ground effects kit on it that the seller told me was an optional package. Does anyone know anything about this package? Was it most likely a dealer installed option? Did the black 16" BBS wheels probably come as part of that package?

Rob Wilson
'88 750 iL

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