Wheel Fitment Guide

R

RGray7

n00b
Jun 21, 2018
2
1
I have a 1983 Oldsmobile Cutlass. I am looking to 20" staggered Rev Classic 100 Anthracite wheels on the car. I need to know the backspacing and tire size that would work. Also would I need spacers? I have searched the site for the answer and either I did not see it or do not understand. Thanks in advance .
 
Qdub24

Qdub24

Royal Smart Person
Sep 6, 2006
1,786
113
Columbus, GA
I have a 1983 Oldsmobile Cutlass. I am looking to 20" staggered Rev Classic 100 Anthracite wheels on the car. I need to know the backspacing and tire size that would work. Also would I need spacers? I have searched the site for the answer and either I did not see it or do not understand. Thanks in advance .
Max wheel backspacing of 4.5" should fit w/o a hitch. I don't know the tire size as I've never had 20s on a G-body. Avoid using spacers/adapters at all cost.
 
UNGN

UNGN

Comic Book Super Hero
Sep 6, 2016
2,579
113
Southlake, TX
I have a 1983 Oldsmobile Cutlass. I am looking to 20" staggered Rev Classic 100 Anthracite wheels on the car. I need to know the backspacing and tire size that would work. Also would I need spacers? I have searched the site for the answer and either I did not see it or do not understand. Thanks in advance .
The ideal offset is about +5mm in front and about -7mm in back. These numbers are close to zero, so Zero offset wheels wheels generally work with a "square" set up, as long as the wheel width isn't much more than 8".

If you upgrade to "big brakes" in front, these generally push the the front end out about 9-11 mm, so this would make the ideal offset in front about 15mm, which pushes the difference in ideal offset from the front to back to almost 1" (21-23 mm difference vs. 25.4mm = 1 inch), which is about the minimum wheel adapter width..

With a staggered set, you don't have to worry about a compromise offset, so look for wheels with zero to -10 in back and Zero to +10 in front.

As you go up in width of wheel (above 8") and tire (above 225 in front, 255 in back), the ideal offset range narrows.
 
  • Agree
Reactions: Injectedcutty
Streetbu

Streetbu

Royal Smart Person
Supporting Member
May 22, 2011
1,599
113
Central NY
Somehow I never added mine to this thread. Running 275/35/18 on all four corners, frame is notched to seam, has RideTech front suspension. Wheels are 18x9.5" with 5.25" backspacing. No rubbing at all.

IMG_20180706_062227.jpg
 
Doug213xrj

Doug213xrj

Royal Smart Person
Dec 30, 2011
1,476
63
West Michigan
78 El Camino, American Racing AR-08 Sawblades 15x8 all four corners. 245 60's on the rear and 215 65's front no issues.
81 Malibu, On the rear.15X8 Rallys with 295 50's rolled quarter panel lip. The front has 15X7 rallys with 215 65's, Again no issues on the front.
 
Clutch

Clutch

Comic Book Super Hero
Apr 7, 2017
4,263
113
Brick NJ
I had E/T drag 29.5X9/15 on 87 442 rims on the beach of my 87 Cutlass with 1/2" spacers. They rubbed just a little on the inner wheel house in the front where the back seat is but they wore in. Lol that count?
 
84dragcutlass

84dragcutlass

G-Body Guru
Aug 20, 2009
900
93
North Vernon IN
I would like to run 15x8 AERO wheels on the front of my cutlass and 15x10 on the rear if possible. Does anyone know what backspacking would work front and rear on that setup and a ballpark on the tire size? I was thinking 3 inch backspacking on the rear but want to make sure im not going to rub anywhere. The front im guessing is about the same, have to admit rim and tire fitting is not one of my strengths
 
Clarkwb100

Clarkwb100

Not-quite-so-new-guy
Feb 7, 2019
34
18
Sugar Land, Texas
After much research and reading all the discussions about wheels and fitments, I used 18" 2012 Camaro wheels with an aluminum 1-1/4" adapter/spacer along with 245 -45 -18". These fit without rubbing or problems.

Replaced 255 -60 - 15" mounted on Chevy Rally wheels. These had numerous problems that required 1/4" spacers, still rubbed at turns and end of driveway turns.
IMG_5923.jpg
 
Bri guy

Bri guy

G-Body Guru
May 18, 2018
611
43
There is so much information in this thread. But is time consuming trying to find out answers to my question. Found a set of rims but i know nothing about fitment...here is the ad i found:
American racing torque thrust for sale. F body fitment. 17x9 front (2.5 BS?) 17x10 rear (7.5 BS)
Nitto nt555r 315/35r17, 255/40r17 $500
Any advice is appreciated.
 
Injectedcutty

Injectedcutty

Geezer
Nov 24, 2014
5,035
113
Louisville, KY
There is so much information in this thread. But is time consuming trying to find out answers to my question. Found a set of rims but i know nothing about fitment...here is the ad i found:
American racing torque thrust for sale. F body fitment. 17x9 front (2.5 BS?) 17x10 rear (7.5 BS)
Nitto nt555r 315/35r17, 255/40r17 $500
Any advice is appreciated.
Nope, only way 7.5" BS gonna fit our cars is with stupid wide adapters (2-3/4" at least) or a minitub.
I'm running a 17x7 front with 4" BS and a 225/50/17 and a 17x8 rear with 4.5" BS and a 255/45/17. Fitment is perfect, no rubbing.
 

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