Wheel Fitment Guide

[dogsht]

Does anyone use 18" drag radials on our cars and if so what sizes? Also anyone remember what the approximate maximum sidewall or section width is? I know it can very a little bit form car to car or actually wheel to wheel but I am thinking about 11.5" safely. I run some now that are 11.10 sidewall with no rub in a 275/50/15.


These look like some that could fit.
Nitto has a 555R in a 285/40/18 26.89 tall 11.42 width

MT has ET Street Radial II 265/40/18 26.5 tall 10.6 sidewall width
305/40/18 28.8 tall 11.8

M&H Racemaster Drag Ra 275/45/18 28.0 tall 10.9 sw I ran a 28.0 10.9 only in a 275/60/15 M&H with great results.

I could not find a Hoosier that I thought would fit in an 18. The original style BFG drag radial is not listed on their site and the g-force drag radial lists some real low profile sizes but no specs. It does not look like anything you would want on the street anyway. I think I would have to buy the M&Hs. Regular radials in these small sidewalls would be too slippery.

Edit Sorry didn't mean to hi jack this thread from wheels to tires. Just meant to find out if anyones using a 18" drag radial.

 

[MD13ailey]

currently running corvette ralleys 15x8 rear 4"bs 255/60/15. 15x7 in front 3.5"backspace 235/60/15.

 

[Bonnewagon]

Update to what I posted earlier about Snowflake wheels. The original Snowflakes that came on Lemans and GrandPrix were 14X6 with 4" backspacing. The 77' -79' "F" body Snowflakes I tried were 15X7 with 4.5" backspacing. There's the rub. I added 1/2" spacers and longer wheel studs. That cured the scraping which occured when the suspension loaded and the upper control arm articulated in such a way that the lip scraped the rim like a lathe. I'm glad that did it because they do look fine.

 

[1980LeMansSafari]

Would I have issues on my wagon with :
15" x 7"', 4" backspacing with 225/60/15 on the front.
15" x 8", 4.5" backspacing with 235/60/15 on the rear?
Wheels are American Racing Ansen Sprint's and the tires are BF Goodrich Radial T/A's.

 

[Bonnewagon]

I think you'll be OK on the front, might scrape a little on a tight turn. But the back may be a tight squeeze. I find the 225's scrub the inner wheelwell a bit when the axle gets bumped up and that's with 15 X 7's.

 

[Blake442]

Would I have issues on my wagon with :
15" x 7"', 4" backspacing with 225/60/15 on the front.
15" x 8", 4.5" backspacing with 235/60/15 on the rear?
Wheels are American Racing Ansen Sprint's and the tires are BF Goodrich Radial T/A's.

4.5" is too much backspacing for the rear... You want 4".

 

[ilduce]

15-inch Pontiac Rally II wheels have bigger bolt spacing so will not fit a 1986 GP with the stock 14-inch wheels (that came with hubcaps). The 14s work no problem.

Does anyone know the cheapest way to get a set of chrome lug nuts? I guess they're 12x1.5mm thread. O'Reilly has them for about $4-5 each. Is there a good place online to get a set of around $20 or so. I can't find sh*t.

 

[383Camino]

I get my lugnuts at local tire shops, Discount Tire for one. They're usually just over $1.00 each.

 

[Bonnewagon]

Check the reference chart below, the RallyII's should fit. You may have a set of 5X5 big car wheels. The 5X4.75 should be fine. I used Firebird wheels on my Bonnewagon. Dorman lugs are available from RockAuto and others, but I get mine locally for $1.25 each.




Pontiac Bolt Pattern Guide
The bolt pattern, lug pattern, or bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs. Bolt patterns can be 4, 5, 6, or 8 lug holes. A bolt circle of 4x100 would indicate a 4 lug pattern on a circle with a diameter of 100mm. The bolt pattern is comprised of two numbers - the first indicates how many bolt holes are on the wheel, and the other describes how far apart they are. A bolt pattern of 5-115mm would mean the wheel has five bolt holes and they are 115mm apart (measured across the center of the wheel). Dual Bolt Pattern: More and more manufacturers are building their wheels with two bolt patterns. This expands the number of fitments the wheel applies to. For example: a wheel with a 4-100/114.3 bolt pattern has 8 lug holes and will fit both 4-100mm and 4-114.3mm fitments. Measuring a 5-bolt pattern: A 5-bolt pattern is very difficult to measure without using a bolt pattern gauge. Basically, you would measure the diameter of a circle that crosses through the center of the lug holes. This method is not recommended to confirm wheel fitment. Please use the below as a reference only.

2008 Pontiac G6

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Pontiac Lug Pattern Reference
MODEL
YEAR
SIZE
P.C.D.
LUG SIZE
MM
OS

ALL MID SIZE( GRAND PRIX,GTO,LEMANS,ETC.) 64-87 14",15" 5X120.7 12mmX1.5 or 7/16-RH - L
ALL FULL SIZE RWD (W/O 403 ENG.) 77-86 15 X 6 5X120.7 7/16-RH - L
ALL FULL SIZE RWD (W/O 403 ENG.) 71-90 15 X 6 5X120.7 1/2-RH - L
AZTEC 01-ON 15 X 6 5X115 12mmX1.5 70.3 H
BONNEVILLE FWD 87-on 14 X 6 5X115 12mmX1.5 70.3 H
FIERO 84-88 13 X 5.5 5X100 12mmX1.5 57.1 H
FIREBIRD 82-92 14 X 7 5X120.7 12mmX1.5 - L
FIREBIRD 93-on 16 X 7.5 5X120.7 12mmX1.5 70.3 H
FIREBIRD,TRANS AM 67-92 14,15 5X120.7 7/16-RH - L
GRAND AM 85-98 13 X 5.5 5X100 12mmX1.5 57.1 H
GRAND AM 99- 16X6.5 5x115 12mmX1.5 70.3 H
GRAND PRIX 88-92 14 X 5.5 5X115 12mmX1.5 70.3 H
GRAND PRIX 88-on 15 X 6 5X115 12mmX1.5 70.3 H
GRAND PRIX, GTP 89-97 16 X 6.5 5X115 12mmX1.5 70.3 M
GRAND PRIX 99-on 16X6.5 5X100 12mmX1.5 57.1 H
J-2000,6000 82-84 13 X 5 5X100 12mmX1.5 57.1 H
LE MANS 88-93 13 X 5.5 4X100 12mmX1.5 57.1 H
MONTANA 99-on 15 X 6 5X115 12mmX1.5 70.3 H
PHOENIX 80-85 13 X 5.5 5X120.7 12mmX1.5 - L
PHOENIX 83-84 14 X 6 5X100 12mmX1.5 57.1 H
SUNBIRD 85-89 13 X 5.5 5X100 12mmX1.5 57.1 H
SUNBIRD 85-94 14 X 6 5X100 12mmX1.5 57.1 H
SUNFIRE 95-97 14 X 6 5X100 12mmX1.5 57.1 H
SUNFIRE 95-on 15 X 6 5X100 12mmX1.5 57.1 H
SUNFIRE 95-97 16 X 6 5X100 12mmX1.5 57.1 H
TRANS AM 84-92 16 X 8 5X120.7 12mmX1.5 57.1 L
TRANS AM 93-97 16 X 8 5X120.7 12mmX1.5 57.1 H
TRANS SPORT 90-97 15X6 5X115 12mmX1.5 70.3 H
TRANS SPORT 90-91 14X5.5 5X115 12mmX1.5 70.3 H
6000 82-89 14 X 5.5 5X100 12mmX1.5 57.1 H
6000 83-91 14 X 6 5X115 12mmX1.5 70.3 H

 

[DSM]

Update to what I posted earlier about Snowflake wheels. The original Snowflakes that came on Lemans and GrandPrix were 14X6 with 4" backspacing. The 77' -79' "F" body Snowflakes I tried were 15X7 with 4.5" backspacing. There's the rub. I added 1/2" spacers and longer wheel studs. That cured the scraping which occured when the suspension loaded and the upper control arm articulated in such a way that the lip scraped the rim like a lathe. I'm glad that did it because they do look fine.

I had the exact same issue on my 83 GP with 15x7 snowflakes. I was able to get away with a 1/4" spacer and the stock wheels studs. The inside of the wheel lip just cleared the a-arm, but I had to remove the clip-on wheel weights and use stick-on weights inside the rim.