14" to 15" Wheels - Vintage Mustang Forums

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post #1 of 100 (permalink) Old 04-20-2017, 04:17 PM Thread Starter
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14" to 15" Wheels

Looking to upgrade from 185/70R14's to 15" Torq Thrust D's.
I have done a lot of research and measurements.
At the front with 15 x 7 Torq. Thrust D's, -6 mm offset, I favor the 205/60R15 tire. This gives me about .5 inch clearance between the inner tire wall and the upper control arm. Anything less than this, I think is asking for trouble. So personally I am shying away from a wider tire at the front with this set up.
At the back I am looking at 225/60R15 with either a 15 x 7, -6mm offset, Torq Thrust D wheel or a 15 x 8, 0 mm offset wheel. I like the staggered tire size look and am OK with a little rake on the stance.
I am still researching and doing measurements before I purchase.

I'd be interested in any thoughts or this set up from other members.
Thanks in advance.
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post #2 of 100 (permalink) Old 04-20-2017, 04:56 PM
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Quote:
Originally Posted by geordie_dave View Post
Looking to upgrade from 185/70R14's to 15" Torq Thrust D's.
I have done a lot of research and measurements.
At the front with 15 x 7 Torq. Thrust D's, -6 mm offset, I favor the 205/60R15 tire. This gives me about .5 inch clearance between the inner tire wall and the upper control arm. Anything less than this, I think is asking for trouble. So personally I am shying away from a wider tire at the front with this set up.
At the back I am looking at 225/60R15 with either a 15 x 7, -6mm offset, Torq Thrust D wheel or a 15 x 8, 0 mm offset wheel. I like the staggered tire size look and am OK with a little rake on the stance.
I am still researching and doing measurements before I purchase.

I'd be interested in any thoughts or this set up from other members.
Thanks in advance.
What year car? I myself would not use a 205 mm wide tire on a 7" wide rim. It is a better fit on a 6" wide rim and I would use a 205-65-15 as the 205-60-15 is a really short tire. I can show you a pic of the 205 on a 6" Torq thrust D if you like. If you are going to use a 225 mm wide tire on the rear use the 7" wide rim as the 8" is really too wide for a narrow 225. A 235 mm tire is the narrowest I would use on a 8" wide rim. I know people do these things but for me I like to fit the best width tire with the best rim width.

Last edited by cmefly; 04-20-2017 at 05:02 PM.
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post #3 of 100 (permalink) Old 04-20-2017, 05:41 PM Thread Starter
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Thanks for the reply.
I'd be interested in seeing a photo of the 205 on the 6" Torq. Thrust D please.


You can't get a 205-65-15 in the BFG Radial T/A.


At the rear I was thinking of the 15 x 8 cause it has a 0 mm offset, the 15 x 7 is a -6mm offset and pushes the tire a little further to the curb side than I like. For the BFG Radial T/A, according to the specs. you can use an 15 x 8 wheel.......but it's the max wheel width.


I've been looking into this, off and on, for months, there is just a bewildering amount of information out there, but not many photos of specific set ups.
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post #4 of 100 (permalink) Old 04-20-2017, 05:41 PM Thread Starter
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My car is a 65 Coupe
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post #5 of 100 (permalink) Old 04-20-2017, 06:34 PM
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Quote:
Originally Posted by geordie_dave View Post
Thanks for the reply.
I'd be interested in seeing a photo of the 205 on the 6" Torq. Thrust D please.


You can't get a 205-65-15 in the BFG Radial T/A.


At the rear I was thinking of the 15 x 8 cause it has a 0 mm offset, the 15 x 7 is a -6mm offset and pushes the tire a little further to the curb side than I like. For the BFG Radial T/A, according to the specs. you can use an 15 x 8 wheel.......but it's the max wheel width.


I've been looking into this, off and on, for months, there is just a bewildering amount of information out there, but not many photos of specific set ups.
The 15x8 has a 4.5" backspace and the 15x7 has 3.75" backspace The 15x7 will actually fit better then the 15x8 as it will stick out 1/4" less even though it has a -6mm offset it is 1" narrower then the 8" rim with zero offset. I have the 15x8 TTD on my 65 Mustang with a 235-60-15 tire but I narrowed my rear housing 5/16" on each side for a better fit. I am not saying you cannot mount a 225 mm tire on a 8" wide rim, I am simply saying it is a better fit on a 7" wide rim. The 15x6 TTD rim is a better fit on the front of the 65 Mustang then the 15x7. This is a pic of the 205-65 15 on a 15x6 and the 15x8 with 235-60-15 rear
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post #6 of 100 (permalink) Old 04-20-2017, 07:55 PM
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Running 215/65R15's on 15 x 7 TTD's on all 4 corners. I think KellyH runs the same size tire on her car.

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post #7 of 100 (permalink) Old 04-20-2017, 08:03 PM
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Quote:
Originally Posted by cmefly View Post
What year car? I myself would not use a 205 mm wide tire on a 7" wide rim. It is a better fit on a 6" wide rim and I would use a 205-65-15 as the 205-60-15 is a really short tire. I can show you a pic of the 205 on a 6" Torq thrust D if you like. If you are going to use a 225 mm wide tire on the rear use the 7" wide rim as the 8" is really too wide for a narrow 225. A 235 mm tire is the narrowest I would use on a 8" wide rim. I know people do these things but for me I like to fit the best width tire with the best rim width.
actually the 205/60 goes very nicely on a 7" rim, i have them on my 64 falcon using fox body phone dial wheels. i had them on my 66 falcon though and they were great on that car.

as i recall the design rim width for the 205 is 6.5" and the 225 is 7". a 235 will also go on a 7" rim as its design rim width is 7.5".

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post #8 of 100 (permalink) Old 04-20-2017, 08:18 PM
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Quote:
Originally Posted by geordie_dave View Post
At the rear I was thinking of the 15 x 8 cause it has a 0 mm offset, the 15 x 7 is a -6mm offset and pushes the tire a little further to the curb side than I like. For the BFG Radial T/A, according to the specs. you can use an 15 x 8 wheel.......but it's the max wheel width.


I've been looking into this, off and on, for months, there is just a bewildering amount of information out there, but not many photos of specific set ups.
Unfortunately most of the "standard backspace" wheels offered by the different manufacturers have too little backspace for a '65/'66 Mustang which puts the tire into the fender lip. Most have a "custom shop" that can build wheels for you with more backspace as needed for an early Mustang but now you're talking $$$.
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post #9 of 100 (permalink) Old 04-20-2017, 08:35 PM
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On a '65, stock with the 205 on the front, especially if lowered any. I would run the 15 x 7 rear wheel, no problems will be expected with that wheel. You could even run a 235 tire if you wanted.
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post #10 of 100 (permalink) Old 04-20-2017, 08:43 PM
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15x7 backspace is ideal at 4.25 problem is that's tough to get with out going custom built. Huskinhano has 215/60/15 on Thrust wheels. Maybe he will chime in until then here is a pic or two of his car


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post #11 of 100 (permalink) Old 04-20-2017, 09:47 PM
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These are 215/60-15 on Ford 15x6 steel wheels w/ 3 7/8" back spacing. I don't think the OP would be happy with any tire that has a shorter sidewall than this. I'm pretty sure 215/65 or 70 would've fit fine, and looked even better.

OP, Yon don't need a 7" wheel for a 215 tire. 6" works really well.



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post #12 of 100 (permalink) Old 04-21-2017, 05:24 AM
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Originally Posted by rbohm View Post
actually the 205/60 goes very nicely on a 7" rim, i have them on my 64 falcon using fox body phone dial wheels. i had them on my 66 falcon though and they were great on that car.

as i recall the design rim width for the 205 is 6.5" and the 225 is 7". a 235 will also go on a 7" rim as its design rim width is 7.5".
That's my point. It is not that you can not run a 205 on a 7" wide wheel it is that both the 215 and 225 are a better fit on that width. So if I use a 7" wide rim the 205 would not be my choice in width.
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post #13 of 100 (permalink) Old 04-21-2017, 08:35 AM
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the published charts on tire width / appropriate wheel width are good guidelines. But thats all they are, just guidelines. Once you get to the extremes of the guide list, then some investigation is called for.

Test fitting several different tire widths on any given width of a wheel is only true test. On a fully inflated tire & with the weight of the car on the wheels, I had MORE tread contact patch with the 215/60-15 & 6' wheel combination than I did with the same tire mounted on a 7" rim.

Just moving up to a 225/60-15 size reversed the results. The 225 had more contact patch with a 7" wheel, and less with the 6" wheel.

so if one is looking to get the most out of their tires, it pays to do a little basic research. I imagine the tire brand and model composition have some impact on the equation. But the tires width is obviously the primary factor at play here.

my 2 centavos

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post #14 of 100 (permalink) Old 04-21-2017, 10:59 AM Thread Starter
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Great information, many thanks.
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post #15 of 100 (permalink) Old 04-21-2017, 11:15 AM Thread Starter
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[QUOTE=cmefly;8957633]The 15x7 will actually fit better then the 15x8 as it will stick out 1/4" less even though it has a -6mm offset it is 1" narrower then the 8" rim with zero offset.


Hello Cmefly, your statement above does not seem to jive with the results I am seeing on the tire offset calculator I am using below. Original set up 185/70R14, -10mm offset. On the left is the 225/60R15, -6mm offset, corresponding to 15 x 7 wheel. On the right, is the 225/60R15, 0mm offset, corresponding to 15 x 8 wheel. This calculator appears to show that the outer sidewall sticks out more with the 15 x 7 wheel.


Help me understand what's going on here please. Thanks in advance.
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