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Join Date: Jan 2009
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Rear Tire Size for 930.

I searched and didn't find anything specific to this so I'll ask here.

I want to get new tires for my 80 930. I have a set of BBS 18x11 rims. I was running 285/30/18s but I want to increase the sidewall profile to add a little pothole insurance. I'm thinking of changing to 295/35/18s. The sidewall profile will go from 3.36" to 4.06 (adds .7" to the wheel/tire radius). I'll change the offsets if I need to.

- Is anyone running a 295/35/18 on their 930?
- If so did you have to modify anything?
- What are you running up front?
- Any comments on handling?

Thanks

Old 10-25-2010, 11:49 AM
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I've been running 295/35/18's on the rear & 245/45/17's on the front for years now.

I just changed to 255/45/17's on the front last friday, when I got new shoes for the old girl all the way around.

Steering is a bit quicker now with the 255's up front, but otherwise the handling characteristics are the same as it has been. the car rides good, handles good, stops good.

I have no clearance issues, and the car sits rather low ( approx. 1" below Euro height).

I run Fikse rims at the standard offset for a no-spacer rear set-up (18 x 11), and an additional 1/4" negative front offset (17 x 8.5) to gain fender clearance for being so low.

Mark
Old 10-25-2010, 12:36 PM
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No help, but I'm running a 315/30/18 Pirelli in the rear.

I'm not sure if you'll notice much difference between the 285 and the 295. Going with a 17" wheel would help.
Old 10-25-2010, 12:37 PM
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Thanks for the responses. It's a big help.
Old 10-26-2010, 05:57 AM
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Mark,
Is there a picture of your rig (with the 295/35/18) posted anywhere here so I can see what it looks like?

Thanks
Old 10-26-2010, 07:11 AM
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Gooyboy,

Yes there is, go to the "pictures of aftermarket wheels" thread linked below, look on page #2, near the bottom of the page.

pics of aftermarket wheels

Mark

Last edited by full quack; 10-26-2010 at 07:44 AM..
Old 10-26-2010, 07:39 AM
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Mark,
My rig is lowered to Euro spec. and my rear camber adjustment slightly out of spec. The wear on the inside part of rear tires is high. You must have the same problem. Have you installed rear camber boxes to allow for camber adjustment on a car as low as yours? Looks great....must handle nice....but can you setup your suspension?

I'm going to install the camber boxes but was wondering if you've solved the problem another way.

Regards,
G
Old 10-26-2010, 04:30 PM
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G,

I'm running rear camber @ 2 degrees, fronts @ 1.6 degrees. Yes the inside of the rears wear a little more, but tolerable.

I get about a years life out of the rears & about double that for the fronts.

My alignment guy hates me, but in the end with MUCH patiance & swearing it comes together.

My sled is a daily driver averaging about 12K a year.

Mark

Old 10-27-2010, 12:36 PM
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