Fitment Confirmation - Chevelle Tech
Wheels & Tires What fits what?

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post #1 of 4 (permalink) Old May 12th, 20, 1:32 PM Thread Starter
Join Date: Jun 2018
Location: Alberta
Posts: 2
Fitment Confirmation

Hello all.

I'm planning a full frame-off paint and restomod next winter...the car will have rack/pinion and coilovers (Speedtech chassis). I was running through the wheel database and posts again. I found LS_5's car, and his setup looks fantastic...I'd ask him more about it directly, but it says he hasn't logged on here in a few years. So a few questions for the wheel gurus:
1. I believe my '69 Malibu and his '70 should fit about the same, is this correct?
2. Is there space to bump the front wheels up to 8.5" width? I'll be getting custom forged wheels, so I should be able to make pretty much any backspacing work.

This is what LS_5 listed:

Front Wheel Size: 18"X8"
Front Wheel Backspace: 4.75"
Rear Wheel Size: 18"X10"
Rear Wheel Backspace: 5.75"
Front Tire Size: 255X45X18 (Nitto 555)
Back Tire Size: 295X45X18 (same)
Suspension mods: 1" shorter springs


Mtriples is offline  
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post #2 of 4 (permalink) Old May 15th, 20, 10:14 AM
Senior Tech Team
Join Date: Apr 2011
Location: Ottawa, On, Canada
Posts: 5,189
Re: Fitment Confirmation

If you want to be sure to only buy once the Wheels with correct BS & Tire Combo that will work for your Car

Read these Threads

Then get your Measuring Tape out

Every car is different from Dr side to Passsenger side and taking measurements of your car's Wheel Fender Wells etc is the key to what Wheel / Tire Combo size will fit without rubbing or hitting anything ;

With the Wheels/Tires removed from Both DR & Pass sides, one side at a time or all same time measure the following;
1. Rear End Width Face of Brake Drum/Disc Driverside to Face of Drum/Disc Passengerside =
2.OUT SPACE from inside Lip of outside Fender to Face of Rear Drum/Disc Brake Hub/Wheel Mounting Pad
.... DR Side = ?? .... PASS Side = ??
3.IN SPACE from Face of Rear Drum Brake Hub/Wheel Mounting Pad to Frame/Inner Fender
.... DR Side = ?? .... PASS Side = ??
4.Total Wheel Well Space = # 2 + # 3 measurements #s .. DR Side = ?? .... PASS Side = ??
if one side is less then use it as the applicable number or make sure the Rearend is centered properly

Important things to NOTE;
1. the Rear Lower Shock Mount Bolt may interfere with the Wheels Rim
2. and yes your car's exhaust may interfer with the Tire on a 10" Wide Wheel
3. Type of Brake system on rearend, Drum or Disc ! as the Disc setup is usually wider than a Drum setup
4. Is Rearend centred ?
5. Has the car been Lowered ?
6. Side Wall/Section Width of the Tire = ??
7. Diameter Height of Tire = ??
8. Size of Wheel you wish run ?
Measure twice and you will only need to buy once the Wheels/Tires you need to fit
within your cars Fenderwells . with the Wider Later Chevelle Rearend in your 67

Provide the #s needed above and then I can Cal for you

67 Chevelle Malibu SS Cdn
Born 283 / PG / A51
468/TH400 2,500 stall/ S60 3.70 Gs
Prev Best on M/T ET S/S #3454 street Tires/Dress 2018/05/20
60' = 1.664
1/8 = 7.532 et / 91 mph
1/4 = 11.814 et / 115 mph
NEW Best with 3,500+ Stall TC 2019/09/08
60' = 1.547
1/8 = 7.311 et / 91.76 mph
1/4 = 11.595 et / 114.28 mph

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Kirk's67SS is offline  
post #3 of 4 (permalink) Old May 15th, 20, 7:28 PM
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Join Date: Mar 2016
Posts: 715
Re: Fitment Confirmation

This is the thing I fret most about of my upcoming decisions. One shes painted, shes going on jack stands, all around, and Im taking copious measurements, then posting them here.

Ive been unable to get Forgestar to give me their inner diameter measurements in order to figure out if their 17 rims will fit my C5 brakes. I guess Ill go 18s just be safe.


1967 SS 396 Chevelle
Formerly Bolero Red
Soon to be a 427 equipped Tahoe Turquoise head turner!
Kopfjaeger is offline  
post #4 of 4 (permalink) Old May 21st, 20, 1:04 PM
Join Date: May 2020
Location: Miami, FL
Posts: 8
If your car will be rolling on a SpeedTech (EXtreme?) chassis your wheel and tire combo can be much wider than that. Are you trying to be conservative with the wheel and tire size?

1970 Chevelle SS / LS + 6 speed =
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