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INFO: The Official Tire Size Thread
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n2fordwagons View Drop Down
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Points: 2268 		Post Options Post Options   Thanks (0) Thanks(0)   Quote n2fordwagons Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2025 at 7:23AM
Update on widest rear tire possibilities. 

Wheels are 15x10 with 5.5” backspace. 

Tires are Mickey Thompson Sportsman S/R radials, size 28-12-r15. Which is approximately 305-55-15. 
Jeff

72 base Torino (modified)
72 Gran Torino Squire
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72 RS 351 View Drop Down
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Points: 3445 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 72 RS 351 Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2025 at 1:46PM
Very beautiful Jeff, the car that is. The tire sizes are great too, a nice look and fit. Well done.
Don
73 Ranchero "Sport 72 front end", floor shift/console, planning EFI 7000 rpm 351 stroker
73 Ranchero GT 351C-4V &4R70W for sale later.
92 Lincoln Mark VII SE GTC, OBDII 347/4R70W
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handsofstone View Drop Down
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Points: 4229 		Post Options Post Options   Thanks (0) Thanks(0)   Quote handsofstone Quote  Post ReplyReply Direct Link To This Post Posted: 12-May-2025 at 1:55PM
Is the backspace really 5.5"? That is insane.
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n2fordwagons View Drop Down
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Points: 2268 		Post Options Post Options   Thanks (0) Thanks(0)   Quote n2fordwagons Quote  Post ReplyReply Direct Link To This Post Posted: 13-May-2025 at 1:40AM
Originally posted by 72 RS 351 72 RS 351 wrote:

Very beautiful Jeff, the car that is. The tire sizes are great too, a nice look and fit. Well done.

Thanks!

Originally posted by handsofstone handsofstone wrote:

Is the backspace really 5.5"? That is insane.  

Yep!  Crazy isn't it.  Maxing it out.  I can't see 6" BS working.
Jeff

72 base Torino (modified)
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Bretticuss View Drop Down
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Points: 39 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bretticuss Quote  Post ReplyReply Direct Link To This Post Posted: 15-November-2025 at 4:47PM
Hello everybody, I have a 71 Ranchero GT I am wanting some new rims and tires for. I am wanting to go with 15x8 front, and 15x10 rear. I’m not opposed to going with 17s if it’ll help me achieve the look I’m going for. I really want tires that will fill the wheel well up, and give the car a Rake appearance. I’m not sure what I need to get in terms of offset and backspacing for the rims, or tire sizes. Any help is greatly appreciated! 
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