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Tires and wheels and rim widths, Oh My!

Hello Gentlemen,
I've been reading here about rim widths ie 7s,8s,9s. I don't know what mine are.
What is OEM rim width, if there is such a thing, on an 88 930? And how do you accurately measure rim width?
My 88 930 has its original 16" Fuchs wheels and has two new 245s in the front and two old 205s in the rear. Tire Rack indicates the OEM size for an '88 930 as 205s in the front and 245s in the rear. Therefore, I suspect the PO installed the new tires on the rear wheels and rotated them to the front.
I will purchase two new 205s (unless this group suggests otherwise) & I will locate them in the front & relocate the front tires (245s) to the rear.
I just want to make sure I buy the right tires and that they are mounted on the right rims.
I wish to keep my stock 16" Fuchs as well as the pretty new 245s (less than 2000 miles) that I have. My car is only driven on the street in nice weather.
Any advice on my proposed tire purchase (205s), how to measure rim width and what stock rim width should be would be appreciated.
Phew!
Thanks in advance.
Jim
Old 07-28-2007, 06:35 AM
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When you remove the wheels.....

they will be stamped on the back side of the petals. 7" fronts, and 9" rears. The 205's go up front, and 245's in the rear, as you said. Who the hell would do a front to back rotation on a 930? That's one for the books......
I believe if yo measure the wheel, aross it's width, without rubber, from lip to lip, you get the 7 and 9 inch measurements.......
You will get a bunch of responses from people running all kinds of sized tires....but 205 and 245 are stock.......

Good luck.

Mark
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OK, I have this car, now things are out of control !!!!
83 930 Turbo....the car I have always wanted!!
K27 7200, Tial 46mm WG with straight pipe, Fabspeed Exhaust,B&B halfbay IC, Wevo mounts, Rennline floorboards, Rennline goodies, Optima mount, Elephant finned oil lines, widemouth cooler, high speed fan.
Old 07-28-2007, 11:01 AM
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Thanks Mark!
Jim
Old 07-28-2007, 01:34 PM
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I believe if yo measure the wheel, aross it's width, without rubber, from lip to lip, you get the 7 and 9 inch measurements......
I've been told (by the Tirerack guys, IIRC) that it's supposed to be measured from the INSIDE of the lip, not just the lip at it's widest point. I had always thought that it's just lip to lip, like you said. 205/55x7 and 245/45x9 are the right sizes, though.
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Last edited by Noah930; 07-31-2007 at 06:20 AM..
Old 07-31-2007, 06:15 AM
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Thanks Noah!
Jim
Old 07-31-2007, 04:39 PM
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Correct measurement is inside lip to inside lip. However, it is easier to measure the outsides and minus 1".
Old 08-01-2007, 03:19 AM
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