I have been looking at Primax wheels in all different sizes. 17x7, 17x8, and 17x9. The only thing I'm worried about is the offset. What is the max amount of offset I can have (front and rear) and still use NO spacers.

Also, what about the bolt size ?
Thanks

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91 Formula
305 TPI 5speed
1LE/G92/WS6

Paxton SN93, SLP airfoil, ported/polished plenum, March pulleys, Crane AFPR(43psi),Crane Gold 1.6rrs,MSD coil,MSD6AL, Holley 9mm wires, fastchip, Bosch O2sensor, Bosch in-line pump(w/stock pump), SLP headers & catback,short shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

My 89 can fit a max of 4.95" in front and 5.85 in the rear backspacing

Here's a site with the actual calculations

Billet Wheel Adapter FAQ

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1989 Camaro Convertible
dark silver w/black top
305tbi, auto, all stock
posi
Check out Phil's Rice Boy Page

 

I used to work at a Discount Tire. Here are the fitments you need:
17X9 = 5" spacing or +12.7mm offset
17X9.5 = 5.5" spacing or +19mm offset
17X10 = 6" spacing or +25.4mm offset
What's nice is you can use a wheel with offsets that are close. Backspacing usually comes in .25" increments, which is close to 6mm. Myself? I am running 18X9.5 wheels front and rear with 5.5" spacing. They are fitments for a BMW 7-series. They clear my suspension and steering components, as well as my Baer brakes. Hope this helps, dude. Go get 'em...

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Old: 1989 Formula, 383", DFI, built 700R4, TFS heads, Mini-Ram, Vortech S-trim 15 psi, 3.70 gears
Best ET: 10.796 @ 125.8 mph

New: 1989 T/A, 400" CNC Bow-Tie Tall-Deck, Accel Pro-Ram, DFI, AFR heads, HRC T76 Turbo, NOS 150-hp dry kit, TH400 w/GV overdrive, 12-bolt w/3.70 gears, 8-pt. S&W rollbar, Spohn suspension, 18" wheels, Baer brakes
Best ET: Spring 2001

Employed at:
Hahn Racecraft
Accel EMIC/DFI Tuning
Turbosystems & Custom EFI

Member of Midwest F-Body Association www.mfba.org

 

Thanks guys.
GMI FAST, do you have to use spacers with your 18x9.5 rims?

 

Absolutely not.

------------------
Old: 1989 Formula, 383", DFI, built 700R4, TFS heads, Mini-Ram, Vortech S-trim 15 psi, 3.70 gears
Best ET: 10.796 @ 125.8 mph

New: 1989 T/A, 400" CNC Bow-Tie Tall-Deck, Accel Pro-Ram, DFI, AFR heads, HRC T76 Turbo, NOS 150-hp dry kit, TH400 w/GV overdrive, 12-bolt w/3.70 gears, 8-pt. S&W rollbar, Spohn suspension, 18" wheels, Baer brakes
Best ET: Spring 2001

Employed at:
Hahn Racecraft
Accel EMIC/DFI Tuning
Turbosystems & Custom EFI

Member of Midwest F-Body Association www.mfba.org

 

GMI fast..where did you get your wheels from. Can you link me to a website where the 18"s you got are?


Also, would these fit my car? 17x7 Primax #618 Racing wheels.Fits 5x100 and 5x114.3 bolt patterns.+38 offset?

Thanks man

 

Sorry, dude. Some things are sacred. Next thing you know, everyone will have the same wheels I do! Just follow the backspacing guidelines I gave you and go shopping. Plenty of companies have 17X8 4" spacing and 17X9.5 5.5" spacing wheels. Here are several:
Centerline
Weld
American Racing
ROH
Budnik
Boyd Coddington
Billet Specialties
Colorado Custom
Eagle
That should keep you busy!

And, no, those wheels won't work. Waaaay too much positive offset. That +38 is like for an 11" wide wheel!!

------------------
Old: 1989 Formula, 383", DFI, built 700R4, TFS heads, Mini-Ram, Vortech S-trim 15 psi, 3.70 gears
Best ET: 10.796 @ 125.8 mph

New: 1989 T/A, 400" CNC Bow-Tie Tall-Deck, Accel Pro-Ram, DFI, AFR heads, HRC T76 Turbo, NOS 150-hp dry kit, TH400 w/GV overdrive, 12-bolt w/3.70 gears, 8-pt. S&W rollbar, Spohn suspension, 18" wheels, Baer brakes
Best ET: Spring 2001

Employed at:
Hahn Racecraft
Accel EMIC/DFI Tuning
Turbosystems & Custom EFI

Member of Midwest F-Body Association www.mfba.org

[This message has been edited by GMI FAST (edited February 06, 2001).]

 

lol. glad i'm not the only one who feels like that about wheels.