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Wheels/Tires

I've STFA quite a bit, but haven't had luck finding definitive info on wheel and tire fitment for the 930. Mine has turbo twists that I feel compelled to swap out as soon as possible.

What is the preferred width combination for these cars, if given any choice? I've seen 8/9, 8/10, 9/11. What is optimal? What is the correct offset? Are spacers typically required?

Same goes for tire size. What is the optimal front/rear sizing combination? I would like to avoid any risk of rubbing under all circumstances... no hassles is a priority over cool looking.

My preference is either the Speedlines like in the attached picture, or the Ruf wheels. I'd prefer to stick with 17s.

Any advice for this novice will be appreciated... and if anyone has a line on something interesting, feel free to drop me a line.

Dave

Old 05-20-2009, 08:31 PM
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9" wide fronts and 11" rears are optimal as they give the largest foot print available without having to roll fenders or relocate the oil line passage in the rear passenger side well. Some have gone with 12" rears but work is required for fitment.

I'd suggest 18" as 17" tires are hard to find, but Summitumo does have a very good, very inexpensive tire for the 17X11 size (I use them on the fronts though), so if you are okay with the lessening selection of tires and hunting for sizes 17" will give the best look and overall appearance.

One thought would be to use 18" rears and 17" fronts in order to keep a more modern and updated tread compound for the rear.

RH/Speedline 3.6 wheels are the shiznit for these cars.
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Old 05-20-2009, 11:13 PM
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As posted on your other thread, I'd recommend 8.5 and 10 x 17 with 225/45 and 275/40 tires.

I always double and triple check wheel offsets myself, but by my calculation these wheels would need a +22mm front offset and 0 to +3 or 4 mm offset. This is for no spacers. If you want to use the rear spacers, add 28mm.
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Old 05-21-2009, 05:41 AM
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Thanks for the responses. I do love the Speedlines, I run the same style wheels on one of my Audis, but they were hell to come by.

I also saw a 930 with OZ Mitos on it... that appealed to me as well... Speedline-like without the $4k pricetag.

The Ruf wheels seem to be very "period correct" for these cars.

I gather that finding 275/40/17s is becoming difficult?

How does the 930 respond to 18s? Does it make a significant difference in ride quality?

Thanks!
Old 05-21-2009, 04:13 PM
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275's are still pretty easy to find, it's the 315's that are difficult.

Also keep in mind there's big weight penalty going from 16's to 17's but it's not as bad going from 17's to 18's.
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Old 05-21-2009, 04:41 PM
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The widest no-hassle wheels are 9&11.
Typical tire size is 245/315
Wheel design preference is sooooo subjective. I've used everything from 15" to 18". The best feel came from the 18" combo. Short sidewalls make for precise feel. Some folks think 18s are too big for the 930 so you'll need to look at a lot of pictures and judge for yourself.
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Old 05-21-2009, 08:08 PM
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I have 255/315 tires and I still have rubbing issues. Maybe it that BFG's are bigger than average but that's why I recommend the 225/275 set up.
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Old 05-22-2009, 04:47 AM
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David - totally agree with you on the BFG's - My 315 KD's rub much more than the Dunlop sport 9000's I had previously did. Think it has to do with the angle of the sidwall - whereas the KD's are not as vertical as the Dunlops were - running 32 psi in each.
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Old 05-22-2009, 06:18 AM
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I have 18's on my 83' 930, came that way, and am ok with it. Running 225/40 and 285/35 right now. Car rides fine. I think if you were to stiffen up the suspension the 18's might be less forgiving, but in a stock set up right now the car rides fine.

IMHO I would rather have a set of 17" Fikse, CCW, etc., just think they look better.
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Old 05-22-2009, 08:57 AM
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BFG TDK's run big. My 315/35-17s rub when crabbing a curb.
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Old 05-22-2009, 01:14 PM
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I would suggest 245 / 315 x 17 tires, as Brian suggested. Lindsey makes a great wheel also Zuffenhausen offers a new Fuch wheel which is just awesome looking and very light. Wheel size wise, 9 / 11 x 17 is the best fit for a 930 w/o having the "rubber band" looking stance - which doesn't fit the 930...
Old 05-22-2009, 07:41 PM
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I run 225/40/18 in front and 285/30/18 in the rear (RH 3.6 rims)... Pirelli P-Zero Rosso's... got to consider butt squat between shifts

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Old 05-23-2009, 01:38 PM
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