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275/50/15 in the back of a 69

2453 Views 6 Replies 6 Participants Last post by  sidewinder
I've seen it, but don't know if any modifications were needed. Anybody here done it? Also considering BFG Drag Radials. Any comments or other suggestions for 1/4 mile street legal tires?
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G

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It should fit as long as your rim has the correct backspacing. A 15x9 or 15x9.5 would be about the max on a 69/70. Definately measure for clearances to see if modifications are needed. Sorry, not sure on Drag tires.

These are approx tire measurements:

Tire: 275/50/15
Height: 25.9"
Tread Width: 8.9"
Overall Width: 11.2"
Rim Size: 7.5" to 11.0"
 

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I'm runnng BFG T/A 275/50/15's on 15x8" rims,but I had to use a narrower diff to get them under the guards, as the rims had only 3.75"backspace.Check Jay's chart.
The original diff had a bias of about 1/2" to the passenger side of the car,& that also helped to compound the clearance problem on that side.With another 3/4" of backspace the wheel/tyre combo would have fittted with the original diff.
Greg
 

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On the street I am running 275-40-17's on a 17 x 9.5" wheel with 6" backspace. You should have no problem as long as you get the right backspacing. Good luck. As for slicks, I use a 28.0 x 9.0 x 15 and have no problems(15 x 8w/5" bs)
 

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easy...i've put 275's on 15 by 7 rims on 69's before..

I currently have 295/50-15's on 15 by 8.5 (yes 8.5...centerline's sillyness) on the back of my 70 and had them on my 69 (don't remember backspacing; something around 4.5"...rubs in extreme situations but there's enough inside space available for more backspace and I could trim the wheel opening lip)
 

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Mustangs of our years came with a zero offset rim, that means that if you have a 8 inch wide wheel you should have 4inches of back spacing. I have found that with a 275 on a correct rim is about the max. A bigger tire pinched on a smaller rim will fit. I run 265's with no problems.
 
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