Max rear tire and wheel?

[Jazzhorns]

This is my first post here. After owning a Duster for several years I finally sold it and was able to find my "Bucket List" car, a 1969 Bahama Yellow RR. I purchased the car in Dec.

I would like to increase the wheel and tire size in the rear and want to put the largest I can on there without making any mods. It currently has Magnum 500's on it and I'm keeping that look, but was hoping to increase the rear wheel width to a 10" with a 275/65 or 275/60. Back space is where I'm a little unclear. Should the backspace on a 10" wheel be 5 or 5.5? Or will neither work. I've been told a 5 will work but I thought I'd better just go to the people that own them for the best advice.

So....I guess the bottom line question is: What's the largest 15" wheel and tire I can get under my 69 Bird without making any mods???

Thank you

 

[Basketcase]

I{ have 2756015s on mine. 15x8, had Magnums with the same tires before I got the Cragars.

 

[Goon]

I have Mickey Thompson Drag Radials on my 69 RR
295/65R15 on 8" wide rims with 4 1/2" back spacing
30.1" tall
11.8" wide

 

[Jazzhorns]

Goon, Are you running stock suspension? Shocks? in the rear?

 

[Goon]

I do have Super Stock Springs. But I read somewhere that this tire size will fit on stock springs. You can look up old posts on this site, there is info on this ?

 

[Jazzhorns]

Thank you.