The Dodge Challenger Message Board

I am getting new tires and rims for my 71. Im going with BFGoodrich Radial TA's, 275/60/15 in rear(15x8or 8.5), and 235 or 245/60/15(15x7) in front. I see it is a common tire size on the forum. My question is: what backspacing on the rims do I need? I'm going to order from summit and I would like to get this right so I dont make the mistake of ordering the wrong ones. It is a four wheel drum car, the backspacing will be the same for all with this same tire right?

Any help will be greatly appreciated!
Thanks

John

sorry guys, I see this has been covered a million times. I read on and found plenty of info. thanks!!