I am planning to run the standard 275/60/15 on the rear of my GTX. What rim size would be best? 15x8 with 4.5 bs or 15x10 with 5.5 bs. Will a 10 inch rim make the tire look wider? Any pics would be great.

Thanks,

Steve

You can do a quick and simple plumb bob measurement from the leaf spring inside edge, the inner wheel house and the rim mounting surface.

The spring and wheel house will tell you the max width and the wheel mounting surface will tell you the backspace.

I just make marks on the floor and then measure with a ruller.

Most all tire manufacturer's have a chart listing the best rim width for their tire sizes. You can find them on the web.

You need to leave a minimum of 1/2" on both sides of the tires for clearance.

I run that tire size on 15x7 but they do bulge noticeably. 10" wide rims would make the tire look wider.

i would go with the 15x8 with 4.1/2 bs this looks really good on b-bodys 10s might have a space issue with the inner well.

15 X 10 5.5 BS.

I have 15x8 2756015 w/5.5bs

Hustlestuff/Basketcase,

How much room do you have at the leaf springs with the 5.5 bs?

Thanks for the replies,

Steve

I have them on 15x8's with 4.5 bs. It gave me 1/2" - 3/4" gap between the tire and springs.
-Eric

My 69 GTX runs 270/60/15s on 15x8's with 4.5 bs - Priceless

Are the rear wheel wells in the 68-70 cars larger than the 66-67 cars?

15X8 on 275/60/15s with 5.5 bs and room to spare

Quote:

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Are the rear wheel wells in the 68-70 cars larger than the 66-67 cars?

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Im pretty sure they are; I had a 67 Coronet a while back and it seems like I can get more tire in the 68; if for no other reason the opening is bigger

Thanks Dan, I assume they are by just reading the posts on tire sizes here.. anyone else?

I have 275/60/15 on 15X7 5.5bs and 1-1½ space between wheel and leaf spring