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post #1 of 14 (permalink) Old 03-14-2009, 06:01 PM Thread Starter
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Tire size conversion

I want to put 60's on the back of my bird. What is a comparable size to the 215/15's so that i don't throw off my speedo? Thanks

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post #2 of 14 (permalink) Old 03-14-2009, 06:45 PM
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post #3 of 14 (permalink) Old 03-14-2009, 07:23 PM Thread Starter
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Thanks for the link bud. Goin by their comparison, 265 would be almost identical in height and within .03%.

95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #4 of 14 (permalink) Old 03-15-2009, 07:25 AM
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Buck,

On what rim?? I've been told you can't stuff a 265/50/16 on a T-bird sport rim(7" wide). So do you have custom (IE Wider) rims? Because you can't put anything that wide on stock 15" rims.

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post #5 of 14 (permalink) Old 03-15-2009, 08:24 AM
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Here's another tire size calculator that I like to use.

http://www.miata.net/garage/tirecalc.html

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post #6 of 14 (permalink) Old 03-15-2009, 11:34 AM Thread Starter
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Originally Posted by PCD View Post
Buck,

On what rim?? I've been told you can't stuff a 265/50/16 on a T-bird sport rim(7" wide). So do you have custom (IE Wider) rims? Because you can't put anything that wide on stock 15" rims.

Stock fanblade rims, but i'm talkin 60 series, not 50??

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post #7 of 14 (permalink) Old 03-15-2009, 12:51 PM Thread Starter
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Originally Posted by Trunk Monkey View Post
Here's another tire size calculator that I like to use.

http://www.miata.net/garage/tirecalc.html
Thanks TrunkMonkey, both are really handy sites.

95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #8 of 14 (permalink) Old 03-17-2009, 11:27 AM
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Buckcreek, do you understand that "60 series" has NOTHING to do with the width of your tires?

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post #9 of 14 (permalink) Old 03-17-2009, 11:42 AM Thread Starter
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Buckcreek, do you understand that "60 series" has NOTHING to do with the width of your tires?
???????????? 70's are wider than 75's, 60's are wider than 70's, 50's are wider than 60's. Explain please

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post #10 of 14 (permalink) Old 03-17-2009, 11:54 AM
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The middle number "50", "60", whatever it is, is only a ratio. The sidewall height in relation to the width of the tire (which is indicated by the "235", "245", "255" etc.).. the larger the number the wider the tire.. I think that the first set of numbers is the tread width in MM(? correct me if I'm wrong anyone), the second set is the sidewall height in relation to the width, the third is the wheel size.

A 245/60/15 has a width of 245 mm, the sidewall height is 60% of that, and it fits on a 15" wheel.


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post #11 of 14 (permalink) Old 03-17-2009, 11:58 AM
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Yup Yup...what Traveler said. The widest accepted tires you can put on the stock 15" wheels are 245/60-15.

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post #12 of 14 (permalink) Old 03-17-2009, 12:02 PM Thread Starter
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Now i'm totally confused. According to the tire conversion sites listed above, to keep the same height and not throw off the stance of car or the speedo, the closest match is a 265 to keep my height the same? I don't want to change the fronts, almost new, so what's the solution?

95 Thunderbird LX 4.6
K&N cold air intake. True 2 1/4" duals, Xenon GFX. 3:55 Trac loc. Beefier trans, 2800 stall convertor, MkV111 aluminum driveshaft.
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post #13 of 14 (permalink) Old 03-17-2009, 12:04 PM
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That may be true, however a 265 (265 MM) is too wide to fit on the narrow stock 15" Wheel. A 245 (245 MM) just fits. and by the way.... Looks very good on there.. (had them before I got my 16" Sport wheels)


1997 Thunderbird Sport
Low Miles
Wifes Car
destined to remain stock

1997 T-Bird GT 4.6
80 MM Mustang GT MAF - P&P'd Mustang GT TB and Intake Plenum - PI Intake manifold - PI Heads
Mark VIII Torque Converter - J-Modded 4R70W transmission - Mark VIII Aluminum Driveshaft - 3.73 gears
PBR Brake Calipers - Eibach Springs - KYB Shocks
'89 SuperCoupe front and rear sway bars
SCT Chip programmed by Lonnie Doll
255/50/16 Falken Ziex ZE-512's
True Dual exhaust with Magnaflow DI/DO muffler
<<< SOLD >>>
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post #14 of 14 (permalink) Old 03-17-2009, 12:05 PM
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the 70 in 215/70R15 is the hight of the sidewall compaird to the tread width(215). so if you want a wider tire you need to look at the first number for the width. Then to keep it the same hight you will need to look at the second number.

A good rule is for every width change bigger or smaller you will need to do the oppasite to the number for hight. same goes with rim size. So one size up from a 215/70R15 would be 225/65R15 and so on.
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