14" to 15" Wheels - Page 2 - Vintage Mustang Forums

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post #16 of 100 (permalink) Old 04-21-2017, 11:26 AM Thread Starter
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Originally Posted by cmefly View Post
The 15x6 TTD rim is a better fit on the front of the 65 Mustang then the 15x7.

Again I'm not understanding this. The 15 x 6 TTD has a +4 mm offset. That moves that inner tire wall on my ride .96 inches further into the wheel well. That will interfere with the upper control arm for sure


This is 'doing my head in'.


Again, help me understand what I'm not seeing here. Thanks in advance.
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post #17 of 100 (permalink) Old 04-21-2017, 11:53 AM
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It may move it farther inward, but the diameter is larger, so oftentimes the UCA is INSIDE the wheel lip instead of directly against it .

Z

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post #18 of 100 (permalink) Old 04-21-2017, 12:26 PM
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Originally Posted by geordie_dave View Post
Again I'm not understanding this. The 15 x 6 TTD has a +4 mm offset. That moves that inner tire wall on my ride .96 inches further into the wheel well. That will interfere with the upper control arm for sure


This is 'doing my head in'.


Again, help me understand what I'm not seeing here. Thanks in advance.
You are not taking in account the rim is 1" narrower on the 15x6. The 15x6 has 3.66" of backspace compared to the 15x7 with 3.75". so the 15x6 is actually farther away from the control arm by .09" and will be farther away from your front fender lip due to its 1" less rim width. Trust me it will fit the front really well. I know as I have them on both my 65 Mustang and 65 Falcon.

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post #19 of 100 (permalink) Old 04-21-2017, 12:38 PM
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[quote=geordie_dave;8959705]
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Originally Posted by cmefly View Post
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.
Am i just missing on your charts the rim width? you must take into account the difference in rim width when comparing the different offsets/backspace as to how it will fit the car. I can tell you from experience of mocking up the 15x8 with 4.5" of backspace on a 65/66 Mustang that you really need a little more like at least 4.75" of backspace for a decent fit. That is why I narrowed my rearend housing 5/16" on each side.

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post #20 of 100 (permalink) Old 04-21-2017, 01:20 PM Thread Starter
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I really appreciate your help and input 'cmefly'. The online tool that I am using does not appear to account for the tire width. I'm sure that you are correct. I think I need to do a little more thinking and sketching just to get it straight in my own mind.
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post #21 of 100 (permalink) Old 04-21-2017, 01:21 PM Thread Starter
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Originally Posted by zray View Post
It may move it farther inward, but the diameter is larger, so oftentimes the UCA is INSIDE the wheel lip instead of directly against it .

Z

Maybe with a much larger wheel but not with a 15"......
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post #22 of 100 (permalink) Old 04-21-2017, 01:27 PM
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Originally Posted by geordie_dave View Post
I really appreciate your help and input 'cmefly'. The online tool that I am using does not appear to account for the tire width. I'm sure that you are correct. I think I need to do a little more thinking and sketching just to get it straight in my own mind.
You are making all this much more difficult that it really is. Each car has some production variances, but for the most part, what fits one car will fit others. That is unless you are really pushing the envelope. I like running a 6" wide on the front and a 7" wide on the rear of a 65/66. That certainly isn't pushing it, but you can run a wider tire which is what I like to do. I also like to see a difference in wheel depth many times. The 6 and 7 will give you that slight amount of depth difference. If going for a road course look, then same at all wheels is good. what are you trying to do here?
post #23 of 100 (permalink) Old 04-21-2017, 02:24 PM
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The maximum rim width for a 205/60/15 is 7.5"

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post #24 of 100 (permalink) Old 04-21-2017, 02:37 PM Thread Starter
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Originally Posted by PetesPonies View Post
You are making all this much more difficult that it really is. Each car has some production variances, but for the most part, what fits one car will fit others. That is unless you are really pushing the envelope. I like running a 6" wide on the front and a 7" wide on the rear of a 65/66. That certainly isn't pushing it, but you can run a wider tire which is what I like to do. I also like to see a difference in wheel depth many times. The 6 and 7 will give you that slight amount of depth difference. If going for a road course look, then same at all wheels is good. what are you trying to do here?

I generally agree with what you are saying.....this should not be that hard......however there is a lot of information out there that quotes tire sizes that 'will fit'......but does not tell you with what offset.
Back to my original post. 1965 Coupe currently running 14 x 7, 185/70R14 all round. Want 15inch Torq. Thust D. BFG Radial TA. Looking for no rubbing, out of the box fit. Going for road course look, staggered, some rake from rear to front is acceptable. At the front looking for modest increase in width. At the back 225 possibly 235, depends on offset.
I'd love for someone to suggest a combo around these guidelines that will fit.....after all it can't be that difficult
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post #25 of 100 (permalink) Old 04-21-2017, 02:38 PM Thread Starter
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The maximum rim width for a 205/60/15 is 7.5"

Agreed
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post #26 of 100 (permalink) Old 04-21-2017, 03:07 PM
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Originally Posted by geordie_dave View Post
I generally agree with what you are saying.....this should not be that hard......however there is a lot of information out there that quotes tire sizes that 'will fit'......but does not tell you with what offset.
Back to my original post. 1965 Coupe currently running 14 x 7, 185/70R14 all round. Want 15inch Torq. Thust D. BFG Radial TA. Looking for no rubbing, out of the box fit. Going for road course look, staggered, some rake from rear to front is acceptable. At the front looking for modest increase in width. At the back 225 possibly 235, depends on offset.
I'd love for someone to suggest a combo around these guidelines that will fit.....after all it can't be that difficult
I thought I did? 15x6 TTD for the front with 3.66" backspace using a 205-65-15 or a 215-60-15 and the 15x7 for the rear using a 225-60-15
http://www.ebay.com/itm/AMERICAN-RAC...JYmfhF&vxp=mtr and this
http://www.ebay.com/itm/AMERICAN-RAC...MAAOSwo4pYmfhr

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post #27 of 100 (permalink) Old 04-21-2017, 03:13 PM Thread Starter
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[quote=cmefly;8960041]
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Originally Posted by geordie_dave View Post

Am i just missing on your charts the rim width? you must take into account the difference in rim width when comparing the different offsets/backspace as to how it will fit the car. I can tell you from experience of mocking up the 15x8 with 4.5" of backspace on a 65/66 Mustang that you really need a little more like at least 4.75" of backspace for a decent fit. That is why I narrowed my rearend housing 5/16" on each side.

With a little sketching and head scratching I have been able to reproduce the results of this online tire offset calculator. The calculator deals in offset, not back space, and is therefore independent of tire width. The centerline of the wheel width is the plane from which offset is measured. This is the same plane of the centerline of the tire on the rim. The offset is measured from this same plane. Therefore it's independent of wheel width, as long as it deals in offset and not back space.
So for the front I cannot use a 15X6 wheel with a 205/60 tire as the inside tire wall will move a further .96 inches into the wheel well (from where it is now)....contacting the UPA. Yet I can use a 15X7 wheel with a 205/60 tire in the front and have about .4 inch clearance to the UPA.
At the rear I still prefer the 15X8 wheel with the 225/60 tire as it only moves the outer wall .41 further towards the curb.
I agree with you that a 235 tire and a TTD wheel probably is pushing it, due to the limited offsets available.
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post #28 of 100 (permalink) Old 04-21-2017, 03:21 PM
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I know you are wanting BF Goodrich but Cooper tire makes this in both the 205-65-15 and 225-60-15. Great tires for the money.
Tire Details - Discount Tire Direct
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post #29 of 100 (permalink) Old 04-21-2017, 03:25 PM
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[quote=geordie_dave;8960449]
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Originally Posted by cmefly View Post


With a little sketching and head scratching I have been able to reproduce the results of this online tire offset calculator. The calculator deals in offset, not back space, and is therefore independent of tire width. The centerline of the wheel width is the plane from which offset is measured. This is the same plane of the centerline of the tire on the rim. The offset is measured from this same plane. Therefore it's independent of wheel width, as long as it deals in offset and not back space.
So for the front I cannot use a 15X6 wheel with a 205/60 tire as the inside tire wall will move a further .96 inches into the wheel well (from where it is now)....contacting the UPA. Yet I can use a 15X7 wheel with a 205/60 tire in the front and have about .4 inch clearance to the UPA.
At the rear I still prefer the 15X8 wheel with the 225/60 tire as it only moves the outer wall .41 further towards the curb.
I agree with you that a 235 tire and a TTD wheel probably is pushing it, due to the limited offsets available.
You are completely wrong in your thinking. How is it possible that myself and others have used the 15x6 TTD wheel on the 65/66 Mustangs with no issues? I even gave you a pic of it on my 65 Mustang. You clearly know more then I do so I give up

Last edited by cmefly; 04-21-2017 at 03:29 PM.
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post #30 of 100 (permalink) Old 04-21-2017, 03:28 PM Thread Starter
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I thought I did? 15x6 TTD for the front with 3.66" backspace using a 205-65-15 or a 215-60-15 and the 15x7 for the rear using a 225-60-15
AMERICAN RACING VN105D Torq Thrust D 15X6 5X4.5 Gray (Qty of 1) | eBay and this
AMERICAN RACING VN105D Torq Thrust D 15X7 5X4.5 Gray (Qty of 1) | eBay

Even the Ebay link you sent me says the 15 X 6 is incompatible
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