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345-35-15's?

I'm fixing to mount some 345-35-15 P-Zero's on 11" BBS wheels. Not too sure about my backspace. I currently have a 1-1/8" spacer on the rear hub.

These pictures are of a car [maybe on this forum] that has the same size tires and wheels that I will be installing.

Any suggestions on the fitment?

I'm going to install a set of rear coilovers because I'm anticipating picking up the rear a little to keep clear of the fenders...

Any other ideas? Thanks, Shannon



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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 06-24-2010, 07:31 PM
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This is what I have right now...

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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 06-24-2010, 07:35 PM
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Shannon,
I ran those tires on my car for 10 years. Actually I ran the Yokos which are 3/4" wider than the P-Zeros. I had to custom space the wheels as it is a very tight fit. I also moved the oil lines and cut the lips off the fenders.
The 345 is really too wide for an 11" rim. My rims are 12" wide and the Yokos bulged on them. Every 930 is a little different as the flaires are welded on so you will have to address the spacing on each side for a perfect fit. My sides are 1/4" different which is not unusual.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-25-2010, 06:42 AM
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Mooney:

I can tell you exactly what is on that car because it's my car. The beauty of cut and paste on the internet. Nice to have an admirer. Those wheels are in part why I bought the car, too cool.

The spacers in the back are exactly1 inch and the car is lowered about two inches from stock and the tires clear with spec camber.
Old 06-25-2010, 06:48 AM
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brings me back to the old days... when i bought my car, it had 345's in back on 3-piece silver BBS's. looked meaner than **** on a silver 930. are tires in those sizes still available?
Old 06-25-2010, 12:18 PM
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Quote:
Originally Posted by RarlyL8 View Post
Shannon,
My sides are 1/4" different which is not unusual.
I'm glad you said that, cuz mine's exactly 1/4" out [wider on the LS]... Just got in from figuring that out... I mounted/installed the tires. Can't go anywhere, cuz they would rub... The LS needs to come in about 3/4" and the RS about 1/2" - - I think I can machine down my spacers accordingly...

Not too sure what to do about the wheel studs... They'll be too long. How do I take 3/4" off of them???
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.

Last edited by mooney265; 06-25-2010 at 08:53 PM..
Old 06-25-2010, 08:18 PM
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Here is a pic from low and behind...

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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 06-25-2010, 08:22 PM
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Quote:
Originally Posted by zaman fu View Post
brings me back to the old days... when i bought my car, it had 345's in back on 3-piece silver BBS's. looked meaner than **** on a silver 930. are tires in those sizes still available?
$562 ea. from Tire Rack...
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 06-25-2010, 08:23 PM
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Quote:
Originally Posted by Brucem206 View Post
Mooney:

I can tell you exactly what is on that car because it's my car. The beauty of cut and paste on the internet. Nice to have an admirer. Those wheels are in part why I bought the car, too cool.

The spacers in the back are exactly1 inch and the car is lowered about two inches from stock and the tires clear with spec camber.
Bruce,

Thanks for "man-ing up" on the car! I went with those tires mainly because of your picture... I figured if he could get them "in there" - - then, I could too!

Thanks - Shannon
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Old 06-25-2010, 08:27 PM
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You can install shorter studs or use open lug nuts. After you machine down the spacers, you may want to trial fit them and see if they fit under the center caps. You might get lucky!

Plan "B" might be to cut the studs down with a zig wheel and smooth the edges up.
Old 06-25-2010, 09:25 PM
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Shannon, I used an extra 1/4" spacer on the left side. As for the studs, I wanted to leave them long so I could swap out wheels and tires that have different backspacing and use different size spacers. To accommodate this I cut the ends off the aluminum lug nuts. I later found you could buy them that way, doh!
You cans see the studs sticking out in the picture below. They are not noticeable.

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Old 06-25-2010, 09:28 PM
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What are you using for front tires? That is the reason I went to larger wheels, the 255/45-15 Yokos became NLA and 225/50-15 is too skinny.
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'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 06-25-2010, 09:33 PM
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Quote:
Originally Posted by RarlyL8 View Post
Shannon, I used an extra 1/4" spacer on the left side. As for the studs, I wanted to leave them long so I could swap out wheels and tires that have different backspacing and use different size spacers. To accommodate this I cut the ends off the aluminum lug nuts. I later found you could buy them that way, doh!
You cans see the studs sticking out in the picture below. They are not noticeable.

Brian,

I have to get my studs shortened because they have to fit behind the BBS screw on cover...

I'm using matching PZero's sized: 225-50-15 - because it's all that's available...
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 06-25-2010, 09:51 PM
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Quote:
Originally Posted by A930Rocket View Post
You can install shorter studs or use open lug nuts. After you machine down the spacers, you may want to trial fit them and see if they fit under the center caps. You might get lucky!

Plan "B" might be to cut the studs down with a zig wheel and smooth the edges up.
You're right, you did suggest that... I think I'm going with this technique... Got too much going on, here... Thanks -- I'll report back when I get them cut.
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LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 06-26-2010, 08:26 PM
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fender width

If I take a tape over the top of the rear wheel, both fenders are the same width 14-7/16.
Old 07-04-2010, 07:32 AM
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off set

My wheels were installed at the time of delivery in 1986 ($4,000 option) and the spacers are 25.4mm.
... in the Badlands en route home to Seattle from Milwaukee.

Last edited by Brucem206; 07-04-2010 at 07:47 AM.. Reason: ad pix
Old 07-04-2010, 07:39 AM
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Bruce, if you're the guy I think you are (from the 911turbo.com days) - is your car packing some pretty big numbers in the Horsepower stakes? (About 1/2 an Eddie Bello! )
Old 07-04-2010, 08:54 AM
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I now have a 26mm [RS] and 19mm [LS] spacer on my car... The tires now fit inside the fenders the same on each side.

I had to take 3mm out of the inside fender lip [with grinder]. Still have 5mm left.

On vacation this week in Fort Walton Beach. Will be back next week to install the Rebel Racing coil overs.

Will report back, once she's on the road again.

Thanks, Shannon
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Old 07-04-2010, 10:06 AM
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15" wheels and tires just look awesome on a 930. I've got 315x30x18's but they just don't look the same.
Old 07-04-2010, 12:08 PM
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TJ:

Not the same Bruce, mine is bone stock.

I am tempted by Brian's threads but haven't taken the leap yet (still satisfied with the gateway drug).

Last edited by Brucem206; 07-04-2010 at 08:08 PM..
Old 07-04-2010, 01:26 PM
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