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Unread 04-16-2014, 10:02 AM   #1
Ripped08
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My 37's aren't?

I have BFG Mud Terrain KM2 37x10.50r17m tires on Walker Evans 8.5x17" Bead lock Wheels with 2000 miles that measure 35 3/4" tall at 35psi. Is this the norm for 37's? Do most tires measure less than advertised? Thanks

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Unread 04-16-2014, 10:05 AM   #2
Agent620
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Yes, this is normal.
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Unread 04-16-2014, 10:17 AM   #3
SLADE
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It's normal for tires to measure less than their labeled size. BFG is even more known for measuring smaller than other manufacturers of the same labeled size.
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Unread 04-16-2014, 10:26 AM   #4
Garza
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A more accurate measurement is horizontally across the tire while it is on the rig, not from the ground to the top of tire.
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Unread 04-16-2014, 10:32 AM   #5
Lenny7
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Jack the tire off the ground to get an uncompressed measurement.
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Unread 04-16-2014, 11:50 AM   #6
SubAtomicGenius
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I thought BFGs were notorious for being smaller than the rated size anyhow.
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Unread 04-16-2014, 11:56 AM   #7
duneslider
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My 35bfg's are like 33.5. But my 33's in both goodyear and toyo were less than 33, both about 32 new.

My mtrk 35's were about 34" though.
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Unread 04-16-2014, 11:58 AM   #8
SubAtomicGenius
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Its common to be about an inch off, however 1.5" is disappointing when you spend all of that money. That is why I'd avoid the BFGs in the first place. My 35" GT Grabbers are only off by 3/4", and that's measuring from the road to the top of the tire.
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Unread 04-16-2014, 12:00 PM   #9
ncb
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Quote:
Originally Posted by SubAtomicGenius
I thought BFGs were notorious for being smaller than the rated size anyhow.
This is true. My 35" KM2s measure a bit under 34". I call them chubby 33s.
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Unread 04-16-2014, 12:08 PM   #10
paul84043
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They never are man....just the way it is. Don't sweat it.
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Unread 04-16-2014, 12:09 PM   #11
cyberpyrot
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Man that sucks $1,800 and they short you some rubber?
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Unread 04-16-2014, 01:57 PM   #12
ancientspear
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Don't Interco and Pit Bull tires measure closer to what is printed on them?

EDIT: Don't forget the width of your rim will adjust the diameter of the tire. In theory the manufacturer is quoting number for a rim in the middle of the range tthey say to put it on... but if you go to the lower or higher end on rim width your mounted tire will change footprint/height somewhat.
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Unread 04-16-2014, 03:30 PM   #13
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it's a crap shoot-

My Hankook Dynapros are advertised at 33.6" and are 33.2"/30psi--installed on 16x8-1/2" rims

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Unread 04-16-2014, 03:36 PM   #14
ROCKR8R
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Actually I don’t think manufacturers give you the measurement of it mounted on a wheel. They are true to measurement un-mounted. So technically they are producing a 37” tire, “oh you wanted them mounted on a wheel?” Seriously though, most if not all are under what they claim when mounted.

BFG is notoriously small. Aside from that, they have no siping and have a weaker sidewall compared to other M/T tires on the market, which is why I tend to avoid them. They do have great traction in mud and slick rocks and their lugs don’t chunk away.

-Dan
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Unread 04-16-2014, 07:38 PM   #15
ancientspear
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My stock BFG lugs are chunking... but way less than the Duratracs I had on my WJ, I guess it depends on the types of trails you subject them to. You are right about traction when things get sloppy and I have run them 37 psi on rocks and they did fine. Just don't air them down below 20 LOL
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