Rear 15" wheel help - Pontiac GTO Forum
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post #1 of 17 (permalink) Old 09-06-2011, 05:39 PM Thread Starter
 
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Rear 15" wheel help

Alright guys I'm having trouble deciding which back spacing and which width wheels to get. I'm wanting to run a reverse stagger setup at the track. I already have Summit Fast Fives on my car in 17's. I want to get the Fast Five 15's for the rear. But not sure on back spacing and width. Any input would be appreciated and helpful. Thanks!

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #2 of 17 (permalink) Old 09-06-2011, 05:51 PM
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Depends on what width you get but generally 10" wide get 7-7 1/2" B.S. and 9" 6-6 1/2" B.S. If it's in a bit too much (too much B.S.) you can always put 1/4" or so wheel spacer on to bring it out but if it's out too far you can't bring it in.

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post #3 of 17 (permalink) Old 09-06-2011, 06:07 PM Thread Starter
 
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Would a 15x8 with 5.5 work? That's what I'm leaning towards

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #4 of 17 (permalink) Old 09-06-2011, 09:16 PM
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It will depend on tire. The stock 8" wheels are about a 6" B.S. equivalent so that will take it out another 1/2" or so. Fender rolling may be needed if you're going to run a good size tire.

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post #5 of 17 (permalink) Old 09-07-2011, 04:24 PM Thread Starter
 
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Fenders are rolled, and I have drag bags as well as adjustable shocks.

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #6 of 17 (permalink) Old 09-07-2011, 05:34 PM
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You should be OK with medium sized tires. One thing I personally hate is jacking up the back end to keep the tires from hitting the fenders. It ruins handling and looks bad. The right wheels and/or tires are the correct way to do it.

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post #7 of 17 (permalink) Old 09-08-2011, 07:19 AM Thread Starter
 
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I agree. I cant stand the raked look. On an older street rod sure, on a new gen not so much. I want to run a 275, so I may have to change wheel brands. But I'm only using them at the track so matching does not matter that much...

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #8 of 17 (permalink) Old 09-08-2011, 11:58 AM
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I agree. At the track I run my drag bags inflated to 15-20# for wheel hop and it doesn't matter what it looks like. For the street I run them deflated with 20mm drop springs and 285 tires. My stock 17" wheels widened to 9" give about a 60mm offset (~7ľ" back space) and with 5mm wheel spacers make it an effective 55mm offset (7" bs). I can do a full suspension travel without rubbing.

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post #9 of 17 (permalink) Old 09-09-2011, 07:27 AM Thread Starter
 
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My drag bags are there if I need them, but most of the time they are deflated...it stiffens the squat just enough to keep wheel hop eliminated. The adjustable shocks help the most. Ride quality with them is second to none, and the adjustabilty makes them extremely helpful. Any ideas on what brands a side from Welds or Billet Specialties would make something like I'm looking for?

05 PBM/RED226/232.578/.587cam,A4 3500 ptc 10" stall, dynomax bullets, 15X10/17X4 Weld RTS...giggle gas..
[email protected], 1.63 60'
New Time... 100HP shot ;) [email protected], 1.88 60' Tire spin much!?
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post #10 of 17 (permalink) Old 09-15-2011, 01:58 AM
 
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I ran 15x8's 5.5bs with a 275 MT Street radial. It was tight, but with a fender roll, it fits. no inside modifications needed.
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