69' Firebird wheel tire fitment

[yama450yfz]

I know I know this topic has been beaten to death time and time again. I have spent the last week searching everything and have found a good start for what I want to achieve, but I will need help before I pull the trigger on a new set of wheels and rubber.

I have a 69' Firebird with all stock suspension. My goal is to achieve a vintage Trans Am look without a mini-tub setup. I plan on rolling the fenders but only within the boundaries as to not disturb the paint work. I am also prepared to move the rear shocks inboard.

Can anyone tell me what the maximum size 15" wheel and tire combo I can put on front and rear and offset? I would really love a 295-60 15x10 on the rear but have found mixed opinions on whether or not it will fit.



Again I am sorry that I am asking on this topic, especially considering this is my first post here. Thank you for your insight!

[dhutton]

275 is tight and you will have to nail the backspacing. Very doubtful you could get a 295 to fit.

Don

[yama450yfz]

275 is tight and you will have to nail the backspacing. Very doubtful you could get a 295 to fit.

Don

looking some more I found someone claiming a 275 on a 15x9.5 with 5.5" bs is the max for a stock rear end 69'. I'm scratching my head here I just can't seem to find anything concrete. Thank you for your reply

[dhutton]

looking some more I found someone claiming a 275 on a 15x9.5 with 5.5" bs is the max for a stock rear end 69'. I'm scratching my head here I just can't seem to find anything concrete. Thank you for your reply

I can tell you concretely that I ran a 275 tire on a10" rim with 5-7/8 backspacing with LS1 disc brakes and it was tight. No way I could have fit a 285 much less a 295 tire. And it was even a 69 Firebird, not that it makes much difference...

Don

[yama450yfz]

I can tell you concretely that I ran a 275 tire on a10" rim with 5-7/8 backspacing with LS1 disc brakes and it was tight. No way I could have fit a 285 much less a 295 tire. And it was even a 69 Firebird, not that it makes much difference...

Don

Don, I would love to see some pics of that set up if you wouldn't mind. Thanks

[dhutton]

Don, I would love to see some pics of that set up if you wouldn't mind. Thanks

Pics here:
https://www.pro-touring.com/threads/...Am-clone/page2

Don

[yama450yfz]

can anyone tell me what the specs are for this set up? It is easier for me to show you guys what I want the finished product to look like. On paper I keep telling myself I need bigger but visually this is exactly what I want.

[TheJDMan]

Those trans-am cars ran on 15x9 wheels per the SCCA rules of the day with 5.00/11.30-15 front, (9 in tread) 600./12.30-15 rear, (11 in tread) tires. As for the maximum size 15" wheel you can fit you would be better off at Camaros.net. Those guys are experts on 70's high performance mods.

[yama450yfz]

Those trans-am cars ran on 15x9 wheels per the SCCA rules of the day with 5.00/11.30-15 front, (9 in tread) 600./12.30-15 rear, (11 in tread) tires. As for the maximum size 15" wheel you can fit you would be better off at Camaros.net. Those guys are experts on 70's high performance mods.

So searching the interwebs I have found that the 5.00/11.30-15 are what would now be a 275/50-15 and the 6.00/12.30-15 are a 315/50-15 that seems huge! someone please correct me if I am wrong.

[yama450yfz]

I'm thinking 275-50 15x9.5 on the rear and xxx-50 15x8 on the front can anyone help fill in the blanks for me?