Aggressive wheel specs for 1979 Trans am

[DM427]

hello all,

anyone installed 18 front and rear or 18 + 19 wheels on 2 gen Firebird with coilovers?



I'm planning to install 18 with front 255 45 18 + 295 40 19 on 10j and 11j wheels. Front coilovers + rear stock leaf springs

[OLDFLM]

I've run coilovers with a 18x8f 255/40/18 and 18x10r 295/40/18 with no other modifications on my car.

[BonzoHansen]

Why do you need a 10" wheel with a 255/45/18? That size calls for an 8-9.5" wheel. Or am I reading this wrong?

[nekkidhillbilly]

Why do you need a 10" wheel with a 255/45/18? That size calls for an 8-9.5" wheel. Or am I reading this wrong?

i run my 72 buick with 8.5 wide wheels and 255 wheels. fit fine.

[DM427]

I've run coilovers with a 18x8f 255/40/18 and 18x10r 295/40/18 with no other modifications on my car.

do you have backspace data for wheels?

my wheels are 8j with 3" backspace front and 10j 3" backspace rear.

did you use lowering leaf springs on back?

I've ordered QA1 550 lbs single adjustment for front and currently keep stock rears, I plan to use same tire sizes 255/40/18 and 295/40/18 but wider wheels like 9,5 front and 11 rear for more lip size.
also plan to install 6 piston 355mm rotors new brakes, but keep drum brakes for rear, will it work normally?

[OLDFLM]

8x8f 4.5bs 255/40/18
18x10r 5.75bs 295/40/18

Search this forum for "Streetking" to see pics of his red 73 Trans Am.
He's running a 295/35/18 on the rear but I like a little more sidewall so I went with a 295/40/18.
I think the taller tire fills the wheelwell nicely on a muscle car.

There are a lot of tire fitment threads on here if you search...
https://www.pro-touring.com/threads/...ght=streetking

[DM427]

thank you!
do you have photos of your car with 255/40 + 295/40 set up?

[OLDFLM]

[DM427]

thank you, is there a video of your car in YouTube?
front 255/40 18 or 255/45 18?

- - - Updated - - -

did you lower rear axles with leaf springs? or you have coilovers?

[dhutton]

do you have backspace data for wheels?

my wheels are 8j with 3" backspace front and 10j 3" backspace rear.

did you use lowering leaf springs on back?

I've ordered QA1 550 lbs single adjustment for front and currently keep stock rears, I plan to use same tire sizes 255/40/18 and 295/40/18 but wider wheels like 9,5 front and 11 rear for more lip size.
also plan to install 6 piston 355mm rotors new brakes, but keep drum brakes for rear, will it work normally?

That is nowhere near enough backspacing unless you have a sky high ride height…

Don