Seth Jones
Well-Known Member
What width and back space? Tire size? looking for day 2 wheel set up for my 74 duster. Post pics if you got 'em!
Who is running 15 inch slots on the front of their 73 and up a body?
- Thread starter Seth Jones
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SpikeWills69
Live Free or Die
I had Wheel Vintique rally's on my 74 Duster (I no longer have the car) and the fronts were 15x6 with BF Goodrich TA's. I don't remember the exact size of the tires, since it has been a while. I did have a small clearance issue with the front fender when backing out of my driveway onto the street. A small bending of the fender flange fixed it. If I can find a photo I will post it.
I know it doesn't fit into your 73+ timeline, but I have slots on my 1971 Demon. 15x4 with 185/70R15 (I believe) and 15x8.5 BS 3.25" 295 60/15 Hoosier QuickTime Pros. Super stock springs in back 002 on both sides to get the height needed. Longer shocks to match.
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68 Formua-S fastback clone 367/A833/GVod/3.55s
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What kind of slots?
Aluminum period wheels with the the kidney-bean slots? or
Chrome-reverse steel slots
And over what brakes?
The reason I ask is cuz;
The flat-spider chrome slots will not fit over disc brakes.
Other than that, everything with the same bolt-circle should bolt on, even Ford wheels.
As to width;
Once you get close to 8" wide, turning can become an issue depending on your ride height, so you gotta tuck it in with a larger backspace.
However, like @SpikeWills69 found out, while backing up turning and riding the brake on factory suspension bushings, the wheel can move towards the front bumper, and rub on the front of the wheelhouse.
But if too much backspace, the sidewall will rub on either the frame or the strutrod. I think on mine, the max backspace was around 4.25inches. For a Zero-offset wheel (to satisfy the SAI,) that makes a wheel width of 8.5 between the outer edges which is normally called a 7.5" wheel.. But I think that you cannot buy a 7.5; your choices are 7 or 8. and both of those will likely come with a bs of 3.75, so then for an off-the-shelf wheel, you are sorta committed to a 7" wheel.
A 7" wheel wants a 7" tread and you might get that on a section width of 8.25. Now in metric, 8.25 is 203mm, so that would be a 203, rounds to 205. So then, the 205 is the right width to run on a 7" wheel.
But, the taller the sidewall, the more wiggle room you have. A 225/75-15 will have a good service life on a 7incher. However, this size tire is about 28.5 tall, which is too tall for the front of your Duster (it looks odd).
A better choice would be a 215/70-15 at ~26.85 tall
If you get an 8 wheel on the front, with a proper backspace, that will want a section of about 235, and to keep the height down it would need to be a 60 series so then, a 235/60-15 is about 26.1 tall.
All numbers above, are my best guess.
You can install wider than these recommended sizes but your tread life at proper inflation pressure, will suffer. To get best treadlife, you the driver, have to experiment with tire pressures. I find the lower limit for me on the front, is about 28 psi. Below 28psi, when cornering aggressively, the tire is already rolling onto the sidewall pretty hard, which is gonna take a good-sized sway bar to minimize, (NOT eliminate). I highly recommend to run the pressures higher, for performance driving, which of course will make the contact patch smaller, making the likelyhood of plowing, all the greater. So the lesson I learned was, for a 50 to 60 series tire, I should run a wheel of not less than 85% of the section width,
thus the numbers are;
195= 7.68, and times .85=6.5" wheel
205= 8.07, and times .85=6.9" wheel, rounds to 7"
215= 8.46, and times .85=7.2" wheel, still a 7"
225= 8.86, and times .85=7.5" wheel, now a 7.5 if available
235= 9.25, and times .85=7.9" wheel, now an 8
245= 9.64, and times .85=8.2" wheel, still an 8
On the back, I run my 295s on 10s at 24psi for long tread life, but because of the rear-steer, it took some getting used. Not recommended for everyone, but that's what it takes for long tread life.
Aluminum period wheels with the the kidney-bean slots? or
Chrome-reverse steel slots
And over what brakes?
The reason I ask is cuz;
The flat-spider chrome slots will not fit over disc brakes.
Other than that, everything with the same bolt-circle should bolt on, even Ford wheels.
As to width;
Once you get close to 8" wide, turning can become an issue depending on your ride height, so you gotta tuck it in with a larger backspace.
However, like @SpikeWills69 found out, while backing up turning and riding the brake on factory suspension bushings, the wheel can move towards the front bumper, and rub on the front of the wheelhouse.
But if too much backspace, the sidewall will rub on either the frame or the strutrod. I think on mine, the max backspace was around 4.25inches. For a Zero-offset wheel (to satisfy the SAI,) that makes a wheel width of 8.5 between the outer edges which is normally called a 7.5" wheel.. But I think that you cannot buy a 7.5; your choices are 7 or 8. and both of those will likely come with a bs of 3.75, so then for an off-the-shelf wheel, you are sorta committed to a 7" wheel.
A 7" wheel wants a 7" tread and you might get that on a section width of 8.25. Now in metric, 8.25 is 203mm, so that would be a 203, rounds to 205. So then, the 205 is the right width to run on a 7" wheel.
But, the taller the sidewall, the more wiggle room you have. A 225/75-15 will have a good service life on a 7incher. However, this size tire is about 28.5 tall, which is too tall for the front of your Duster (it looks odd).
A better choice would be a 215/70-15 at ~26.85 tall
If you get an 8 wheel on the front, with a proper backspace, that will want a section of about 235, and to keep the height down it would need to be a 60 series so then, a 235/60-15 is about 26.1 tall.
All numbers above, are my best guess.
You can install wider than these recommended sizes but your tread life at proper inflation pressure, will suffer. To get best treadlife, you the driver, have to experiment with tire pressures. I find the lower limit for me on the front, is about 28 psi. Below 28psi, when cornering aggressively, the tire is already rolling onto the sidewall pretty hard, which is gonna take a good-sized sway bar to minimize, (NOT eliminate). I highly recommend to run the pressures higher, for performance driving, which of course will make the contact patch smaller, making the likelyhood of plowing, all the greater. So the lesson I learned was, for a 50 to 60 series tire, I should run a wheel of not less than 85% of the section width,
thus the numbers are;
195= 7.68, and times .85=6.5" wheel
205= 8.07, and times .85=6.9" wheel, rounds to 7"
215= 8.46, and times .85=7.2" wheel, still a 7"
225= 8.86, and times .85=7.5" wheel, now a 7.5 if available
235= 9.25, and times .85=7.9" wheel, now an 8
245= 9.64, and times .85=8.2" wheel, still an 8
On the back, I run my 295s on 10s at 24psi for long tread life, but because of the rear-steer, it took some getting used. Not recommended for everyone, but that's what it takes for long tread life.
Seth Jones
Well-Known Member
I'm looking to buy new US 101 aluminum slots from Summit or Jegs. 15X8 in the rear and undecided on the front,maybe the 15X5?. Car has stock 73+ disc brakes. Would like to switch these back and forth between my 69 Super bee as well.
Seth Jones
Well-Known Member
What tire sizes? Any pics?
14" SBP fit the Darts, 7" Wide Rims, and Big Block Lower Leafs on the leaf stack to get it up. No Air Shocks.
Old School at its Best:
Jesus Chrysler, that is Perfect!
☆☆☆☆☆
Old School at its Best:
Jesus Chrysler, that is Perfect!
☆☆☆☆☆
diymirage
HP@idle > hondaHP@redline
Ill be back in town on sunday, sure i got the specs listed on here bit its a lot easier to look it up on the computer
diymirage
HP@idle > hondaHP@redline
took me a minute, nitto 555, 275/60-15 on 15x8s in the back
4.5 inches of backspacing, and i need a 3/16th spacer to clear the springs
and 15x7 with 3.75 backspacing with 205/65 up front
4.5 inches of backspacing, and i need a 3/16th spacer to clear the springs
and 15x7 with 3.75 backspacing with 205/65 up front
Seth Jones
Well-Known Member
Finally got my slots on. 15x8 rear 4 inch backspace with 275/60-15 and 15x5 front with 215/65-15. Fronts rubbed a little when turning so I made longer fender to bumper struts and trimmed the lower flange in the fender a little. All good now.
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