widest tire with spring relocation

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jeffs67dart

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I have a 67 dart and the widest tire I can fit is a 255/60r15. just want to know if I can fit a 275/60r15 if I relocate the springs only without mini tubbing it. if I mini tub it I will want to narrow the axle, I may do it later but at least maybe get a wider tire under it for now. any knowledge will be appreciated. thanks
 
I have a 67 dart and the widest tire I can fit is a 255/60r15. just want to know if I can fit a 275/60r15 if I relocate the springs only without mini tubbing it. if I mini tub it I will want to narrow the axle, I may do it later but at least maybe get a wider tire under it for now. any knowledge will be appreciated. thanks
i have a 73 and we moved the springs in and used the spring relocation kit to move them in under the frame , and i want to say i have just enough room for the 275 , but another thing we did was moved the spring reward like and 1.5" , so we basically altered the wheelbase , because of front wheel well clearances , and this made it nice . i have aftermarket quarter panels on the car and the wheel lip seems longer than stock going toward the tire , and my tire rub a little in tight cornering , going to have to roll the inner lip to stop the rubbing , we also shortened the axle , so now the wheels have a deep dish to them . im also in michigan ,see ya ed
 
Are Barracuda wheel wells bigger than Darts? I have seen a 67 Barracuda with 275 60 15's with stock spring location.
Assume it's all in getting the backspacing correct.
 
-- just want to know if I can fit a 275/60r15 if I relocate the springs only without mini tubbing it. --
-- Yep !! I did that with a 68 Dart.
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If all you want to fit is 275/60s on your 67 Dart, you don't need to do the full 3" spring relocation. If fact, there wouldn't be a point to doing the full 3" relocation if you didn't plan on minitubbing, as once you move the spring inward past about an inch, maybe even less, the stock inner wheel tub becomes the limiting factor, not the spring

You should be able to fit that tire with just a 1/2" offset kit. If you're pinching pennies, you can simply redrill the front and rear spring hanger holes a 1/2" inward and install new spring perches, to accomplish the same thing.
 
-- If all you want to fit is 275/60s on your 67 Dart, you don't need to do the full 3" spring relocation. _ _ _ _ _ _ You should be able to fit that tire with just a 1/2" offset kit.
-- Yep ! That's what I did. -- BUT-- I thought that the kit was 3/4". - Probably not a big deal - Also, I had 15" X 8" Mopar Steel wheels, with altered back spacing. - Don't remember the BS.
 
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Here's my 67 barracuda with springs relocated,and mini tub. The tires are 325/50/15. If you can it worth the work to mini tub it.
 
-- Yep ! That's what I did. -- BUT-- I thought that the kit was 3/4". - Probably not a big deal - Also, I had 15" X 8" Mopar Steel wheels, with altered back spacing. - Don't remember the BS.
I have 255/60 r15's on the rear of my 70 Dart, with 8.75 rear n small bolts...

But I had relocated the spring perches in 3/4 inches (which only gives u like 1/2 inch more room), and also had 5 1/8 backspaced steel wheels made, so it is centered nicely. I can actually fit 275/60 r15's now very easy with plenty of room to spare...

The fronts are 215/65 r 15's to fit well up front turning-wise...
 
Barracuda's have larger wheel tubs than Darts, so you can't compare to the barracuda body style. You can run 275s on a bone stock barracuda, stock spring locations.

The "3/4" inch Mopar Performance kit isnt really a 3/4" relocation. The front hanger is only a 1/2" relocation, that's all the room there is to the frame. Their shackles are a 3/4" offset, so basically if you put the perches on the axle 3/4" in you're side loading the springs. Not much, but you are. Dr. Diff sells an offset kit that's a 1/2", so that's what a lot of people reference.

Regardless, even the 1/2" spring offset makes the wheel tub the most limiting factor. If you're not going to do a mini-tub, there's no reason to do a 3" relocation. It doesn't buy you any more room than the 1/2" offset. And on most Darts you can fit a 275 with just the 1/2" offset.
 
I have 275/60 15's on my 68 dart. It has spring relocation .
On my 71 Twister I had 255's on 15 7's stock .
 
I have 275/60 15's on my 68 dart. It has spring relocation .
On my 71 Twister I had 255's on 15 7's stock .

The dusters are like the barracuda's. A 275 will fit with no modifications at all. I have 295's on my Duster with a 1/2" spring offset and some quarter lip trimming.
 
The dusters are like the barracuda's. A 275 will fit with no modifications at all. I have 295's on my Duster with a 1/2" spring offset and some quarter lip trimming.
3/4" offset, wheel lips slightly rolled, front of rear fender rolled under and trimmed to look like stock, (made and used an exact template of wheelwell), dana 60 w/ disc brakes, running 295-65-15 drag radials, w/ cal trac system. ---68 fastback
 
Guy asks about putting a wide tire on his 67 DART and gets responses for Barracuda and Dusters. LOL Gotta love the internet. Hopefully the OP understands not all A bodies are created equal.
 
well i forgot to mention i do have mini tubs with a full backseat , but for the 73 we had to alter the wheel base to make a 275 fit in the front and do the full 3" under the frame relocation kit on it . and if you want to go any wider plan on back halving it because it right at the frame on the inside . has not to jump track has anyone used the quarter lip roller from eastwood that hooks to the axle when working with these inner wheel wells ??? thanks ed
 
Thanks everyone for your words of wisdom. I really like the way your 68 looks RPMagoo. I know I am going to relocate the springs soon and I might just mini tub it at the same time. I'm just going to buy the spring relocation kit from US Car Tool and they also make a mini tub kit. Thanks again everyone that replied.
 
Guy asks about putting a wide tire on his 67 DART and gets responses for Barracuda and Dusters. LOL Gotta love the internet. Hopefully the OP understands not all A bodies are created equal.

Every time someone asks about tire sizes the responses include different models of A-bodies. Dart's, Scamps, and Valiants are similar for tire clearance. Even those models vary by model year a bit. Then there's Duster and Demons, and Barracuda's are their own thing really. Based on the measurements they have a bit more room than even the Dusters do, so you can't compare them to anything in the front or the back.

The only thing that is pretty much the same is the frame to inner wheel tub relationship (down to assembly tolerances anyway). So, across all platforms, doing a 3" spring relocation but leaving the wheel tubs stock is a waste of time. The wheel tub is the limiting factor after just a 1/2" offset. After that it doesn't matter where the springs are for tire clearance, the wheel tubs are the limit. But the size of wheel that will fit in the tub varies greatly by model.
 
I'm in the process of doing the same thing. One thing that was pointed out is by going to a larger dia wheel you can get better rubber. I'm going with 17s 8 front 9 rear.
Pretty sure it will require "adjustments", also relocating springs in 3/4" (1/2") respectively.

Don't want to do the 3" relocation because this is a road car, it needs to have the best handling I can get and don't want to mess with spring rates.

My comment is only directed at tire choices, I want modern sticky rubber. YMMV
 
Im running 275/60/15s on a 71 Dart. 3/4 offset spring kit, rolled quarter lips. 15x8 steel wheels with 5 inches of backspace. Hope this helps
 
Im running 275/60/15s on a 71 Dart. 3/4 offset spring kit, rolled quarter lips. 15x8 steel wheels with 5 inches of backspace. Hope this helps
What brand offset kit and tire are you using.
Im running 275/60/15s on a 71 Dart. 3/4 offset spring kit, rolled quarter lips. 15x8 steel wheels with 5 inches of backspace. Hope this helps
Absolutely not highjacking the thread just gathering info.
What brand offset kit and tires are you using?
 
I think the offset kit was Mopar Performance. If I remember right I bought it used off this site. Tires are MT drag radials. They hook well and work good on the street

image.jpg
 
I think the offset kit was Mopar Performance. If I remember right I bought it used off this site. Tires are MT drag radials. They hook well and work good on the street

View attachment 1715004090
I have the same car, same color. Oops, on closer look, mine is a 72, not a 71. Mine needs more HP to get the tires off the ground...
 
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Just FYI, you can really use either offset kit. The Mopar performance 3/4" offset will not get you a full 3/4" of tire clearance. Moving the perches in 3/4" doesn't change the fact that there's only a 1/2" offset at the front hanger. The tightest clearance between the tire and the spring isn't at the perch, it's at the tire's section width. Since the front spring section is 20" long, the best you'll probably do is having the section width at the halfway point, which would mean you might gain an additional 1/8" of clearance. But the taller your tires are the smaller that advantage would be.

And, it's pretty much moot anyway. The 1/2" offset already makes the wheel tub the limiting factor. I only did a 1/2" offset on my Duster. Before I installed my rear sway bar I would get some rubbing on the inner wheel tub if I cross-axled the car going over a speed bump or drainage, but I've never had the tires rub on the springs. You need a lot more clearance to the wheel tub than to the spring because of the way the tire and suspension move.
 
I don't know what your car measures...

But I have my layout notes on my '73 Duster that could be used to back figure other models. I used the mini tub & spring relocation kit from US Car Tool.
(All dimension where taken from vertical plane through rear axle on a layout table).
Outside of rear fender to outside of rear fender = 71 5/8"
Inside of fender lip to inside of fender lip = 68 5/8"
Inside of trimmed fender lip to trimmed fender lip = 69 5/8" (1/2" each off lip)
Outside of frame rail to outside of frame rail = 38 7/8"
After mini tub I have 39 1/4" clearance between tubs. (It's just the way it works out when you rotate a tire in the mini tubbed fender well).
I got 15 3/8" of clearance +/- 1/8" (They aren't perfectly even side to side do to production tolerances).

What I did get was enough room to properly fit a 355/30/19 tire with room for it to move while cornering.
 
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