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I am interested in a set of Torque Thrust D's, Steel Styled Wheels or Magnum 500 for my 1965 fastback. I have lower the car 1". I want to put 15" rims on the car and am wondering if there are requirements I have to follow (off set) for purchasing rims. I am looking for used rims and am wondering if I can buy any set that I find. Can anyone tell me the off set I need to follow?
 

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The best situation is to purchase them at a tire shop and require one be mounted and checked for clearance before installing all. It may cost you a couple bucks more, but you won't fail to get it right. That said, you'll need about 4" backspacing on 15"x7" wheels.
 

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First off, here is a very clear and easy to follow Tire and wheel chart maintained by a VMFer
http://www.classic-mustang.net/wheels/

Secondly:
http://users.zoominternet.net/~dodgeram/images/65MUS073.jpg

I have 15x7 ttd with 3.75 backspace
I run 215x50x15 on all four points with a one inch drop all the way around with no problem. I could easily run a 215x60x15 on these wheels on my car, but since I am planning on going a little lower still, I am sticking with the lower profile tire.
 

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Just for fun I mounted two of the 235/60x15 15x7 magnums from the Boss onto the 65 f/b.
I put them both on the Pax side and left the 14s on the other.
I'll try to scare up the dig pics I took, but here are my observations.
235/60x15 are too big for the 65. It's not a matter of width, but of bulk.
The sidewalls are too tall -- maybe 50 series in this size would look better.
The tires just seemed to overwhelm the car.
The magnums, even with a 4" backset are pretty much out to edge of the sheetmetal.
On the fronts I was afraid to turn the wheel for fear of bending sheetmetal. On the rear I thought it a better fit.
This is based upon Dunlop GT Qualifiers of the size noted above.

Anyway, I'll try to send or post a pic or two of that experiment.

The Boss (low res) pic is at:
http://homepage.mac.com/bossbill
to show what it looks like on that car.

BossBill
 

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As mentioned by others the max you can run in a 60 series on TTD are 215 width. If you want to run 225 series, step down to 14 inch wheels and run them on Magnum 500s which have a nice deep 4 1/8" backspacing. (I have both is why I know).
 
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