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post #1 of 4 Old 06-04-2004, 09:08 PM Thread Starter
x wheelin
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tire size question

I just got a couple of old spares for my tj,
the only problem is i dont know exactly what sizes they are

one is a bfg mt and its A 255/85/16 and the other is a trxus m/t and its a 235/85/16

can anyone tell me how tall and wide theses are?

thanks

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post #2 of 4 Old 06-04-2004, 09:31 PM
YJWOLF
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255/85R16 is close to a 33"x10"

and the 235/85R16 is close to a 32"x9" or so.


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post #3 of 4 Old 06-04-2004, 11:59 PM
BigWaylon
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YJWOLF is right on...there are online calculators, but it's a calculation you ought to know how to do anyway...

quick tire lesson (for you and anybody else that scans)...

255/85/16...is a tire that is 255mm wide, with the profile being 85% of that, made for a 16" rim...

so, the width is 255/25.4 (25.4 millimeters in an inch)...
and the height is the profile multiplied by the width, and doubled (to account for the top and bottom), converted to inches, and then add the wheel size, so 255*.85*2/25.4+16

using that, you get the following:

255/85/16 = 33.07x10.04x16, so a 33x10.00x16 tire (don't think you'll find one of those)
235/85/16 = 31.73x9.25x16, so 32x9.00x16 or 32x9.50x16 (another size that I don't recall seeing)

new information for some..."who gives a rat's" info for some...and common knowledge for others...

so, if you've been waiting to learn something new, and you just did, you can now go to bed...

Greg

2001 TJ 60th Anniversary Edition (details in Profile)

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post #4 of 4 Old 06-05-2004, 09:50 AM Thread Starter
x wheelin
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Thanks alot guys,

For letting me go to sleep
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