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Unread 05-27-2009, 08:31 AM   #1
JeepRookie01
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Need conversion help!! 265/75/16

265/75/16 equal to 31s or 32s?? Thanks in advance.

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Unread 05-27-2009, 09:06 AM   #2
TJWilley
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means, the tread is 265 mm wide
the side walls are 75% as talls as the tread is wide
265 X .75 = 198.75 mm
with a 16 in. rim size.
so the over-all diameter of the tire is 16" plus 2 times 198.75 mm.

1 mm = 0.0394 in, hence 198.75 mm = 7.83 in.

16 + 2(7.83) = 16 + 15.66 = 31.66 in. I'd call them 31's... just because you'll lose the 1/2 in. when you put a load on it.
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Unread 05-27-2009, 10:51 AM   #3
03silversport
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265/75/R16 = 31.5X10.5

Thats what the math comes to, keep in mind every manufacturer will vary slightly
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Unread 05-27-2009, 02:30 PM   #4
JeepRookie01
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Cool, thanks.
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Unread 05-27-2009, 07:46 PM   #5
green89yj
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There are tons of tire size converters on the internet. You could use a couple just to double check the math.
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Unread 05-27-2009, 08:04 PM   #6
fullhouse
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Quote:
There are tons of tire size converters on the internet. You could use a couple just to double check the math.
are you talking about a tool that convert tire size? yah, there are couple in the net you just need t to be patient in searching.
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Unread 05-28-2009, 07:54 AM   #7
03silversport
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Or you could just do the math with the proper formula

265/75/R16

Take 265 (width) and multiply (x) by .0394 (universal,works with any size)

and you get 10.44 which = the width of the tire

Now take 10.44 and multiply (x) by .75 (sidewall) which = 7.83

Now take 7.83 x 2 (you have 2 sidewalls) + 16 (wheel diameter) and you get

31.5 which = the height of the tire

We discoverd the width earlier (10.44) and now we just figured out the height (31.5) so we have a 31.5 X 10.5 R16

This is by far the easiest formula as opposed to the one posted earlier in this thread. Put it on a small piece of paper, stick it in your wallet and you will forever have the tire size conversion confidence that every jeeper desperately needs and wants
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Unread 05-28-2009, 04:50 PM   #8
green89yj
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Very nice. I will write that down. Thanks.
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Unread 06-27-2009, 03:48 PM   #9
stoneywaves
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What would be the best gear ratio for 265 75 16.
Thanks
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Unread 06-27-2009, 05:36 PM   #10
Mean Max
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Conversion calculator here.

http://www.redrock4x4.com/tech/tire_calc.php

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Unread 06-27-2009, 10:48 PM   #11
stoneywaves
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Gears

thanks mean max I would like to know what gears should I be using to compensate for the increase in wheel size 4.10's 3.73's etc.
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Unread 06-27-2009, 10:56 PM   #12
Mean Max
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thanks mean max I would like to know what gears should I be using to compensate for the increase in wheel size 4.10's 3.73's etc.
Use the calculators at www.4lo.com to calculate gear ratio/tire size/RPM with your current setup and then with the new gears. If you make the calculations using the stock gear/tire size you can see what the RPM's were at a given speed, and then calculate to see what gears would work with the new tire size to make it close to or better than stock.

Fill out your profile so that your questions can be answered more accurately.

If you have an AX-15 5 speed (for example) you would need to know that the 5th gear overdrive ratio is 0.79 to properly calculate RPM's in 5th gear.

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