Biggest tire on a 15 x 10 4 inch backspacing

[Toddmc66]

Just purchased the factory replica gbodyparts.com Wheels. Rear wheels are 15 x 10 with 4 inch backspacing. Anyone know the biggest tire you can put on these? My fenders are rolled. If anyone has these's Wheels with rolled fenders what size are you running?

 

[Grumpy]

Not that big. you have air bags ?? 10" rims really make a 275/60/15 huge. Had a friend that ran radial T/As on them . They did stick out some. I am sure others will chime in as far as tire sizes. Good Luck

 

[conn84gn]

I'm currently running Nitto NT 555 R Tires 275/50R15 from Summit racing on a 10" rim ( might be 9.5" wide)
Backing spacing is 4.5" Have QA1 now but also ran with springs and air bags
Tires are 26" tall might be issue with 28' tall

 

[Toddmc66]

Thanks for the pics looks great. I have the Gbody parts replica wheels. 15X10 4.5 back spacing. Fenders are rolled frames (not) notched.
I put Micky Thompson ET street SS 295/55/15 on and they fit perfect. No rubbing the fenders or frame. No airbags either. The inner part of the tire is about 1/2 an inch from the frame. Seems every Buick is different when it comes to the alignment of the rear end. Guess I got lucky. I keep reading and hearing about this size tire rubbing on other cars.