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Old 09-18-2013, 05:32 PM   #1
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My tire is not really bigger than yours

So, what's the deal with tire sizes?? 35 isn't always a 35. 37 may or may not be a 37. This is on a par with a woman's jeans, when the girl with the serious tush is somehow, inexplicably, a size 6. Really?

I like 35's, but I really want a 37. But I have been told that some 37's are really a 36.2. I could do that, but I don't know which brands are actually smaller than listed.

So help a brother out; looking for a 37 that isn't really.

Thanks

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Old 09-18-2013, 05:55 PM   #2
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I think you'll have better luck in the tire thread. So you want a 37 that is a true 37 so that it measures very close to 37 inches?

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Old 09-18-2013, 05:57 PM   #3
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Check the manufacture's website. They usually tell you the true height.
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Old 09-18-2013, 05:58 PM   #4
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Try www.tirerack.com and you can put in your metric tire size and it will give you the inch tire size.
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Old 09-18-2013, 05:59 PM   #5
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I think there are two things that cause this... First is the rounding up or down of metric sizes to their approximate inch size. 315/70/17 is equated to 35", but its actually a little smaller.

The other thing is that the tire diameters are calculated before mounting. A 35" can lose half an inch or more mounted, so it seems pretty easy to imagine a 37" shrinking down to 36" on a wheel.
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Old 09-18-2013, 06:04 PM   #6
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Your stock 32" is a 31" so a 35" is still 11/2" taller. A 37 21/2" taller.
You can look at it that way

Yes, there are tires closer to advertised height - -meaning they're actually taller tires.

Almost every tire is 1-11/4 smaller mounted. Just the way it is
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Old 09-18-2013, 06:11 PM   #7
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Try www.tirerack.com and you can put in your metric tire size and it will give you the inch tire size.
Not all of us run metric tires.
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Old 09-18-2013, 06:25 PM   #8
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Not all of us run metric tires.
They give the actual dimensions of standard and metric tires on their site.
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Old 09-18-2013, 07:20 PM   #9
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I think you'll have better luck in the tire thread. So you want a 37 that is a true 37 so that it measures very close to 37 inches?
No, what I am looking for is a "small" 37. I just want bigger than a 35.

I have stock flares and, no, I am not worried about flexing as I don't crawl. Used for water and mud only.
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Old 09-18-2013, 08:03 PM   #10
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No, what I am looking for is a "small" 37. I just want bigger than a 35.

I have stock flares and, no, I am not worried about flexing as I don't crawl. Used for water and mud only.
You would want to ask around for people who have chalk tested their "37s".

I'd bet most are around 36.5 when operational.
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Old 09-18-2013, 08:11 PM   #11
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P metric sizing is normally a lil bit smaller
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Old 09-19-2013, 05:36 AM   #12
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Try KM2s. They run a little smaller. My 37s mounted came out to 36"
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Old 09-19-2013, 06:39 AM   #13
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There are a lot of threads on this.

Basically, manufacturers measure from the ground up including the bulge of the sidewall, while mounted on a specific width wheel (which they also list for you). So if you measure this way, you'll get the same thing they list in their data sheets.

But, 99% of us measure from the ground up in a straight line. Therefore, we will always get a smaller diameter number than what is listed.

So, the published data on tires isn't wrong it's just that we measure differently than they do.

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