17” wheel and tire combo fit?

[1911a1]

I was gifted some wheels and tires that appear to be borderline too big.

I don’t know the exact wheel measurements but I’ll tell what I do know

The fronts and rear are both 5-4.5” ford Mopar

The front wheels are 17” with an approximate 4.75 - 5” back space
The tires are 235/45 R 17
They are about 24.5” tall

The rear are 27” with a 5.5”-5.75” backspace
The tires are 285/40 R17
They are about 26.125” tall

I didn’t try to measure how wide the wheels were but they are more inset than off set. I bet the fronts are 8” and the rear 9-10”

I’ve googled some info but I still thought I would ask here directly

Thanks!

 

[dano]

What car? What fits a Duster in the rear may not fit a Dart.

 

[1911a1]

Sorry it’s a 74 Duster. It has factory front disc brakes and the 7.25” diff. It’s has a 318 and a 904 but was factory a slant 6

 

[72bluNblu]

The fronts might fit. If they're a 17x8 a 5" backspace is about the minimum you'd need. Tires are a little short. With that tire they might be a 17x7.

Rears will not fit with what you've got. With a 7.25" rear the rear end will be too narrow for that backspace. A 17x9" on a 7.25 can't be more than 4.75" of backspace. I know, I fit a set of 17x9's with a 5" backspace on my '74 Duster with 275/40/17's and needed a 1/4" spacer just to get the tires not to touch the springs. You'd need a wider rear axle or some 1" spacers to make that work. Even then, 275's are about the widest you can go without any kind of cutting/rolling/trimming with the stock spring locations.

 

[1911a1]

The fronts might fit. If they're a 17x8 a 5" backspace is about the minimum you'd need. Tires are a little short. With that tire they might be a 17x7.

Rears will not fit with what you've got. With a 7.25" rear the rear end will be too narrow for that backspace. A 17x9" on a 7.25 can't be more than 4.75" of backspace. I know, I fit a set of 17x9's with a 5" backspace on my '74 Duster with 275/40/17's and needed a 1/4" spacer just to get the tires not to touch the springs. You'd need a wider rear axle or some 1" spacers to make that work. Even then, 275's are about the widest you can go without any kind of cutting/rolling/trimming with the stock spring locations.

Thanks for the info
So I need to at least get a 1” spacer for the rear? And some trim/clearance mods on the rear and maybe front fenders

 

[dano]

Thanks for the info
So I need to at least get a 1” spacer for the rear? And some trim/clearance mods on the rear and maybe front fenders

If you flip the wheels over the bolt pattern, wheel size and offset could be cast or marked into or on the wheel. if it says something like "ET25" you have a 25 mm offset from the center of the wheel. I think start with finding out exactly what you have for width and offset.

Lastly, pics of the wheels!!

 

[Professor Fate]

All good information, but here's how you'll know for sure:
You were given the wheels/tires, so jack up the car and try 'em on.
Support the front under the control arms, and the rear under the shock plates so the suspension is loaded with the weight of the car.
If the front fits, have a helper cycle the steering left to right while you look for obvious or potential points of interference. Then do the same thing with the front on the ground. give the front a few good bounces at various steering positions to see where things may interfere.
Trying to fit the rears on should point out any issues right off the bat. You'll know right quick what fits or how far off it is, especially if you don't know what size the wheels are.

 

[1911a1]

Think aI found the wheel on Intros website I can’t believe it’s still there because they’re so old. I think there is a 2006 date on the wheel

Vista - Exposed | Intro Wheels

Vista - Exposed

introwheels.com

The website shows a -80,80 offset

They are definitely more width inside than outside the hub

 

[1911a1]

it’s difficult to read the stamping especially on the 9” wide wheels
The best I can decipher
Something I can’t read then17x10SI J then 2 top. Part of vertical line 501 DOT USA SPS (or SBS) 06\120/06 808467 B

The last series of number the first could be a 3 but I think it’s an 8

The wheels measure a little over 9” wide and 10” wide

 

[dano]

it’s difficult to read the stamping especially on the 9” wide wheels
The best I can decipher
Something I can’t read then17x10SI J then 2 top. Part of vertical line 501 DOT USA SPS (or SBS) 06\120/06 808467 B

The last series of number the first could be a 3 but I think it’s an 8

The wheels measure a little over 9” wide and 10” wide

So that one is 10" wide inside the bead and close to 11" wide over all. Measure the back space, and subtract 5.5 from your back space measurement and times that by 25.4 and that will give you your offset in millimeters. A negative number is an acceptable result.

i.e. (back space - 5.5) * 25.4 = offset in mm

 

[1911a1]

So -5.5 x 25.4 =-139.7 for the 10” wide wheel
And -4.75 x 25.4 =-120.65 for the 9” wide wheel

 

[1911a1]

Later in the week I may have some help to check the fit That suggestion how to jack the car up but keep the weight of the car on the suspension was a good one.

 

[72bluNblu]

So -5.5 x 25.4 =-139.7 for the 10” wide wheel
And -4.75 x 25.4 =-120.65 for the 9” wide wheel

Yeah neither of those make any sense at all.

Typically the wheels offset will be stamped in MM followed by the letters "ET".

Regardless, I don't think those wheels are going to work for you.

If the front's are 17x9's they don't have nearly enough backspace, so they're probably going to hit the fender even with a narrow tire.

In the back, 17x10's aren't a good choice at all for a car with the stock spring locations. A 17x10" is 11" wide outside lip to outside lip. A Duster with the stock leaf spring locations has about 12" from leaf spring to quarter lip. So right off the bat even if you center everything perfectly in the wheel well you're only going to have a 1/2" clearance on each side. But the tire is going to overhang the lip of the rim, so, you won't even have that. You can get away with less than a 1/2" clearance to the springs, but not to the quarters if you don't want any rubbing.

You have the wheels so there's no harm in checking, but those wheels are not going to be a good fit without a lot of work.

 

[1911a1]

The 17x10s when mounted on the rear have too much inset and rub on the leaf springs
The 17x9s would work on the rear but need a taller tire.
Didn’t try the wheels on the front but I bet they won’t work

Too bad those are beautiful billet wheels