Largest Tire Size on Stock GTX

[1969VAGTX]

I'm sure this question, or one like it, has been asked many times. I'm getting ready to install the Diamondback Redlines on my GTX on the factory 15" steel wheels. However, I am also considering buying some different wheels to have as an alternative for the car (like Magnums or Torq Thrusts). What is the largest tire size that can generally fit under the rear of a stock GTX? And is there a smaller tire size limit for the fronts? Would appreciate any insights. Thanks.

 

[BLK 68 R/T]

I’ve seen a 295/50/15 on the rear of a 68 GTX. Tight fit for sure.

 

[forphorty]

275/60-15 on a 15x8 4.5 bs fits real nice on 68-70.

 

[moparedtn]

275/60-15 on a 15x8 4.5 bs fits real nice on 68-70.

Exactly what I have on my '68 GTX. They fit like they came that way.

 

[fratzog lover]

Exactly what I have on my '68 GTX. They fit like they came that way.

Perhaps a picture of Fred is in order.

 

[Runcharger]

My 69 Hemi X. 275X60X15.

 

[33 IMP]

I have had 10.5x28 slicks on my 69 runner (but it does have rolled wheel lips). Essentially the same as a 295/55x15. (M/T makes a drag radials that size) They were on a 15x8.5 centerline with 4 7/8 bs. The backspace HAS to be right to get the "most" tire under any car.
Frankly, I think 275/60x15 on an 8", 4.5 bs combo is the golden child.

 

[BeepBeepRR]

I can't read the tire size too good because it was scraped off on my friends GTX but be careful I think these were 235/50/15 You can barely make out the numbers on the top right of the tire. These were just put on the car and driven a mile to his house. This is a 10 inch wide rim.

 

[33 IMP]

I can't read the tire size too good because it was scraped off on my friends GTX but be careful I think these were 235/50/15 You can barely make out the numbers on the top right of the tire. These were just put on the car and driven a mile to his house. This is a 10 inch wide rim.

View attachment 1259418

In my humble opinion.... a 10"rim can work on a 68-70 bee, because of the more open wheelwell. I DONT think a 10 works on a rr/gtx. It's simply too big.
That tire that he just cut up MIGHT have worked fine on the right 8/8.5 rim.

 

[BeepBeepRR]

In my humble opinion.... a 10"rim can work on a 68-70 bee, because of the more open wheelwell. I DONT think a 10 works on a rr/gtx. It's simply too big.
That tire that he just cut up MIGHT have worked fine on the right 8/8.5 rim.

I thought the 10 inch wheel was overkill anyhow. I think they look a little odd with the deep dish area.

 

[moparedtn]

Perhaps a picture of Fred is in order.

15x7 Magnum 500's up front, 15x8 rears. 225/70 and 275/60 tires....
There's about enough room to sneak your fingers up between tire and fender in the rear.
IMO a 10" wide rim with the same tire just looks goofy.

 

[nomadci]

275X50X15 on a 10" wheel 1970 Roadrunner

 

[Outlawd]

15x8 wheels with 275/60 tires on rear about a half inch of fender clearance and 1 inch away from springs.

 

[moparedtn]

275X50X15 on a 10" wheel 1970 Roadrunner

View attachment 1259491 View attachment 1259492

Mercy, that's all the tire, ain't it?

 

[gkent]

28 x 12.5 15LT These on a 10" wheel with 5-1/2" backspacing will clear everything

 

[440SportSatellite]

I ran 295/50/15 on 15x10 wheels with 5.5" backspacing on my '69 Sport Satellite for several years. It was very tight but would only occasionally rub just barely at the top of the wheel well where it comes in some.

 

[roadrunnerh]

@moparedtn VERY nice looking '68! Is Fred RR1 Burgundy Metallic?

 

[Remusa12]

I run 275 60 15 on a 7 inch rim on a 69 bee.

 

[BIGT10]

275X50X15 on a 10" wheel 1970 Roadrunner

View attachment 1259491 View attachment 1259492

What’s your backspacing on the wheel? Looks great!

 

[nomadci]

What’s your backspacing on the wheel? Looks great!

5 1/2