Will these 18" wheels fit my stock 77?

OLDFLM · Sep 8, 2011

Fronts are 18x8 with 4.750" Backspacing(Had them made to clear C5 brakes)
Rears are 18x10 with 4.50" Backspacing(Had them made to clear LS1 brakes)
Chevy lug pattern

Billsvette · Sep 8, 2011

The rear wheels will stick out a little ,you need 5 or 5 1/2 BS to fit 10 inch rim under fenders. The fronts will have too much BS,it will hit frame,you need 4 to 4 1/2 at the most to fit a 8 inch rim under the front fenders. But you could use a spacer on the fronts to get them out more.

blckslvr79 · Sep 8, 2011

:agree:

OLDFLM · Sep 9, 2011

I don't want to run spacers... I can be patient for the right rims with the correct backspacing.

So what are the ideal backspacings for 17" or 18" rims for a 77 Corvette?

What are the ideal tire sizes? I plan to lower the car an inch or so... don't want any rubbing issues...

Thanks guys!!

blckslvr79 · Sep 9, 2011

Billsvette covered the needed backspace in his post.
OEM was 4" with an 8" wide rim.
Desired backspace will depend on what width you are running.

18x8 front with 4" back space and 18x10 with a 5"-5.5" backspace will work fine. Any more backspace and you may have rub issues. On the rear, if you want to lower the car, you'll probably want the 5.5" so the tire tucks under the car further.

FYI- On the rear, you'll probably need to move the parking brake bracket and could have clearance issues with your sway bar. Some guys remove the rear sway bar or modify it.

Tire size is discretional and will depend on what overall diameter and width you want. I like either a 245/40/18 front and a 275/40/18 rear combo or a 255/40/18 and a 295/35/18 combo.

:cheers:

OLDFLM · Sep 9, 2011

GREAT INFO!! And thank you both!

I've got a 71 Firebird that I'm running 18x8 and 18x10s on but the backspacing is entirely different.

I'm new to the C3 world and have to admit that I know nothing about them or SBCs!

OLDFLM · Sep 12, 2011

Tire Size Recommendations

Guys,

Can I go 245 or 255/45/18 up front and 285/40/18 or 295/40/18 in the back without rubbing issues? I want to put as much tire in there as possible but don't want anything sticking out either... lmk

V/R,
Ty

blckslvr79 · Sep 12, 2011

OLDFLM said:
Guys,

Can I go 245 or 255/45/18 up front and 285/40/18 or 295/40/18 in the back without rubbing issues? I want to put as much tire in there as possible but don't want anything sticking out either... lmk

V/R,
Ty

285 will be tight. 295...probably a bit wide without sticking out some. I'm running a 285 on 10" and it's a bit meaty.

Again-with any of these tires on a 10" rear, you may have to remove your sway bar and move the parking brake bracket. :thumbsup:

Art Jett · Sep 12, 2011

I'm running 255/45-18" on the front on 8" rims and 275/40-18" on the rear with 9 1/2" rims. No rubbing issues.

Will these 18" wheels fit my stock 77?

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