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Unread 02-02-2011, 11:40 AM   #1
trowand
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Are 315/70/17's 35's?

I've got a 2" Old Man Emu lift on my '09 Rubicon Unlimited and I'm about to get new tires. I've been wanting to jump up from my Rubi's stock 32's to 34's along with 1.25" or 1.5" wheel spacers. When I look up metric size tires, 305/70/17's come out to be 33.8" x 12" while 315/70/17's come out to be 34.4" x 12.4" according to some of the many tire size calculators online. I can only find ONE 305/70/17 that I like (Maxxis Bighorns) but there are MANY options in the 315 size which are bigger but I'm afraid they will be too big. So one of my questions is are the 315/70/17 what we commonly call 35's? Even though the calculators online call it 34.4" high?

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Unread 02-02-2011, 11:48 AM   #2
dsjk
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my Goodyear Duratrac 315/70/17's measured at about 34.7 and like 13ins wide
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Unread 02-02-2011, 12:08 PM   #3
gdub
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This should help...

http://1010tires.com/TireSizeCalculator.asp
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Unread 02-02-2011, 12:34 PM   #4
Woodchuck
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Here is how you do it:

Take first number (tire width - 315) and divide by 25.4 to convert to inches.
This is the width of the tire in inches (12.40).
Then multiply the result (12.40) by the second number (aspect ratio - 70) divided by 100.
This gives you the sidewall hieight (8.68).
Multipy sideway height (8.68) by 2 and add to the last number (wheel diameter - 17).
This give you the total tire height (34.36).

So this tire is 12.40 inches wide and 34.36 inches tall.

Hope this helps and is not too confusing
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Unread 02-02-2011, 12:58 PM   #5
2012Rubicon
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Quote:
Originally Posted by Woodchuck View Post
Here is how you do it:

Take first number (tire width - 315) and divide by 25.4 to convert to inches.
This is the width of the tire in inches (12.40).
Then multiply the result (12.40) by the second number (aspect ratio - 70) divided by 100.
This gives you the sidewall hieight (8.68).
Multipy sideway height (8.68) by 2 and add to the last number (wheel diameter - 17).
This give you the total tire height (34.36).

So this tire is 12.40 inches wide and 34.36 inches tall.

Hope this helps and is not too confusing
OOOOrrr you can be lazy, post a thread asking, and have someone else do the math (I 100% perfer the latter)

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Unread 02-02-2011, 02:59 PM   #6
MrOrange
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To the OP, yes the tire in question is equivalent to 35's. A lot of tires measured in inches aren't exactly what they imply. Most 35in tires measure less and are just rounded up. If you go to any manufacturer's website, they will have a spec sheet breaking down the actual measurements of the tires.
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Unread 02-02-2011, 03:41 PM   #7
jstrubberg
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At 30 psi, mine are 34.25.
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Unread 02-02-2011, 06:15 PM   #8
RescuedJK
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my procomp extreme mt's measure out to 34.4"
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Unread 02-02-2011, 07:39 PM   #9
wh1plash
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Quote:
Originally Posted by gdub View Post
Hey thanks for that link, it just what I've been looking for this week.

Been wondering how exactly you tell what range of tire width is optimal for a certain size rim. For instance, how wide of tire I'd need for a 17x9.
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Unread 02-02-2011, 10:48 PM   #10
No_Return
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Tires with the same (315/70/17) dimensions can vary by 1/2" or more in Actual Size.

Make sure you check the actual size with the tire manufacturer... Places like tirerack also have the actual sizes as well as a tool to compare.
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Unread 02-03-2011, 01:00 PM   #11
ChicagoGuy
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Quote:
Originally Posted by wh1plash View Post
Hey thanks for that link, it just what I've been looking for this week.

Been wondering how exactly you tell what range of tire width is optimal for a certain size rim. For instance, how wide of tire I'd need for a 17x9.
It's not a hard and fast rule, but generally I look at rim size as fine for a tire 1 and a 1/2 times size. IOW, a 9" rim would be good for up to 9+4.5=13" tire.
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