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post #1 of (permalink) Old 05-27-2001, 01:07 PM Thread Starter
 
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what are 205/75/r15s?

What height do 205/75/r15s translate to in inches? I could never figure the translation out...

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post #2 of (permalink) Old 05-27-2001, 01:11 PM
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Re: what are 205/75/r15s?

not sure what it is in inches but it is the stock tire size for the samurai

87 samurai convertable
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225 75 r15
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post #3 of (permalink) Old 05-27-2001, 01:24 PM
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Re: what are 205/75/r15s?

well... you could go here to find out http://www.miata.net/garage/tirecalc.html

JKing
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post #4 of (permalink) Old 05-27-2001, 01:29 PM
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Re: what are 205/75/r15s?

205/75/R15
205=205mm=8.07"
75=section width=75% of tire width=6.053"
R15=Radial/wheel size
theoretical 27.106

hth

Scott Whitmore
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post #5 of (permalink) Old 05-27-2001, 01:44 PM
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post #6 of (permalink) Old 05-27-2001, 02:05 PM Thread Starter
 
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Re: what are 205/75/r15s?

thanks

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post #7 of (permalink) Old 05-27-2001, 02:14 PM
 
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Re: what are 205/75/r15s?

<font face="Comic Sans MS">The example I used is a 215/75r15.

First number in metric is width of the tire (in MM). Second is aspect ratio. This is the ratio between the width (the first number) sidewall height. If you multiply width (first number) by the decimal version of the second number (in this example, it's .75), you will get the sidewall height from rim to tread.

Now the calculations go like this:
1" = 25.4mm

So, 15" = (15" * 25.4mm/1") = 381mm.

Now take the width (215mm) and do the following:
(215mm *.75) and multiply by 2 (one for each side of the rim), and add the rim width.
215mm *.75= 161.25mm *2 = 322.5mm (plus) 381mm = 703.5mm

To get that back to inches, use:
703.5mm * (1"/25.4mm)

In other words, either multiply by (1/25.4) or divide by 25.4 which does the exact same thing.
So the tire height in this example in inches is approximately 27.697 inches. Keep in mind that the tires typically don't measure exactly as stamped.

And to get the width of the tire is just take the width and multiply by 1/25.4, which ends up being 8.465".

Not only what to do, but how to do it...

On the other hand 205/75r15's are about 8" wide and total height of around 27.1 inches. Keep in mind that they probably won't measure quite that much on the vehicle... [img]/wwwthreads_images/icons/crazy.gif[/img] </font>

Tim "Sandman"

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post #8 of (permalink) Old 05-27-2001, 03:28 PM
 
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Re: what are 205/75/r15s?

all these calculations were very confusing to the old country boys that started using bigger tires so they just said hey we'll make it easy on them 33" inches tall 12.5" inches wide on a 15 inch rim simplicity at its finest..

Mark
90 samurai,5.5 SPOA,2"over shackles,front locker,welded rear removable doors,working on onboard air,
96 sportage 4x4 wifes grocery getter.
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post #9 of (permalink) Old 05-27-2001, 04:35 PM
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Re: what are 205/75/r15s?

Yall do know there is a calculator for this stuff and stuff for R&P' sizes at:
www.intercotire.com
plus you can get overall tire sizes!

Thanx
Studly
92 Zuki/235's/1.6(soon)/Still Building
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