Wheel/tire question for 1971 GMC

[GMCdriver]

I have a chance to buy a set of used Torque Thrust II's for my truck. They are 505's (2 piece I think?) 15x8 with 3.75" offset. My truck is stock height. My question is will these work and what would be the best size tire? I am thinking 255 70 15's for the tires all the way around. I am new to this and want to make sure these wheels will work. Thanks!

[GMCdriver]

Here is a pic. 1971 GMC swb, 350, 3 speed column shift, 100% stock original except for a new steering wheel. Still wondering about the 15x8 torque thrusts. Anyone?? Thanks

[GMCdriver]

I'll try to post some more pics when I get home later today.

[GMCdriver]

After 2 days of searching the forum and reading as much as I could about wheels, backspacing, offset, etc., I think the wheels that I am looking at will work. They have 4.25" backspace and with 275/60/15's or 255/60/15's, should clear everything with no problems. If I'm wrong, someone please correct me! Here's a couple of my driving project. One as it is now, and one from the day I brought it home.

[GMCdriver]

Picture from today.

[lolife99]

4" backspace is usually the max on a 5" wheel before you have rubbing issues up front.
Are you sure of the backspace numbers?

[68Stepbed]

That's the same backspacing as my old AR Hopsters. Yes, they will work great stock height or lowered.

This pic is only lowered 1" front 2" rear.



same wheels, lowered 3.5/5

[GMCdriver]

I am not 100% sure of the 4.25 backspace. He said they were 3.75 offset. He may mean backspace instead of backspace. I am supposed to talk to the guy afterwhile. This has been an eye opener for me! So much for just picking out wheels and tires and calling it good!

[68Stepbed]

Standard backspacing on most aftermarket 15x8 wheels is 3.75". Many people get offset and backspacing mixed up

[GMCdriver]

I called him and he said the offset is 3.75, but I bet he is meaning the backspace. I am going to check them out and pick them up in a couple of days. Thanks