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View Full Version : anyone know 255/85/16 actual size?


black95
07-20-2012, 05:07 PM
Anyone running these tires and can get a true measurement for me?

Trying to plan a build, I would love to know the actual size of these tires. Seems these days, nothing is the actual size they say it is. I have 33/10.50's on my FJ40,and they only measure 31.25. And I have 265/75/16's on my pickup that measure 31, where the conversion calculator says they should be 31.5. I'm looking for something bigger than a 35, but I don't like the look of a wide tire, and I would want less rolling resistance to save bearings, and as much gas as possible.

If the 255/85's actually measure 33" like the conversion calculator says, that would be ideal. I've had 35's that only measured 33 3/4 to 34".

corsair23
07-20-2012, 05:55 PM
You might be able to get an estimate but a true measurement will depend on the tire make. 255/86/16s will vary from manufacturer to manufacturer just like any other sized tire.

Try a search from the main forum on 255/85 and read some of the threads. One I saw mentioned that a set of 255/85 BF Goodrich KM2 tires on a 16" rim measured around 33.3x10

That said, I seem to remember reading threads from some members really liking the 255/85 size tires for the tall/skinny aspect :)

black95
07-20-2012, 06:06 PM
The Km2 is exactly the tire I'm looking at. I already have a set on my 4runner, the only thing I don't like is that they are terrible in the ice, but excel everywhere else. I just can't understand why no one makes a 35/10.50 or 11. I grew up in Louisiana when everyone was running tall skinny Q78 Gateway Buckshots and co op tires. Just really love the look of tall skinny tires.

Jacket
07-20-2012, 09:06 PM
I've got Bighorns mounted on my 40 that come in at about 32.5 x 10 - actual contact patch at 40psi is more like 8 or 8.5. But they've got 10-15k miles on them.

SteveH
07-20-2012, 11:28 PM
There is a tire chart on the BFG website - hard to find, but it shows all the various diameters, revs per mile, etc. for all the sizes they sell.

rover67
07-21-2012, 07:27 AM
http://www.tirerack.com/tires/tires.jsp?tireMake=BFGoodrich&tireModel=Mud-Terrain+T%2FA+KM2&partnum=585QR6KM2RWLV2&vehicleSearch=false&fromCompare1=yes&tab=Specs

looks like 33.3"

coax
07-21-2012, 07:28 AM
Interco makes a SSR and a Bogger in a 35x10.5, not sure what make or type of tire you are looking for.

kurtnkegger
07-21-2012, 08:17 AM
Here's a link to a tire size calculator.

http://www.xtremeterrain.com/tire-size-conversion-metric.aspx

It will convert metric to sandard sizes, and vice-versa

Corbet
07-21-2012, 11:11 AM
Toyo MT's are listed as a 33.5" on their site. (255/85r16)

Caribou Sandstorm
07-24-2012, 09:27 PM
Toyo MT's are listed as a 33.5" on their site. (255/85r16)

I am running the Bighorns in a 255/85/16.. looks like the Toyos are slightly taller at 33.5. Think about that compared to a 285/75/16 at 32.7....

That is almost an inch taller..

AxleIke
07-24-2012, 10:31 PM
I think the OP wants an actual measured tire width and height, on a specific rim. Keep in mind that the actual diameter of the tire will vary slightly with rim width, and from manufacturer to manufacturer. I've always checked the BFG site and once I've had tires mounted, they never match the numbers there.

And the calculator isn't going to help, other than give you the metric equivalent. The actual size will vary.

AxleIke
07-24-2012, 10:35 PM
The Km2 is exactly the tire I'm looking at. I already have a set on my 4runner, the only thing I don't like is that they are terrible in the ice, but excel everywhere else. I just can't understand why no one makes a 35/10.50 or 11. I grew up in Louisiana when everyone was running tall skinny Q78 Gateway Buckshots and co op tires. Just really love the look of tall skinny tires.

Actually, a friend of mine talked to some tire manufacturers as SEMA a few years back.

There is a very good answer to that question: The majority of the market for large sized aggressive tires is the full size market. You know, the F-350 with 18 inches of lift. And, even the smaller jeeps and yotas, for the most part, prefer a wider tire. There are a select few, like you, me, and others, who see the benefit of a tall skinny tire, but the majority of tire buyers want a fatter, aggressive looking tire.

Which is why BFG and Goodyear told my friend that they would never produce a 35x10.5 tire.

black95
07-25-2012, 06:23 AM
Yup, unfortunately, popular demand drives sales. That's what happened to the solid axle too. I do understand the benefit of going wider after you go taller for stability reasons. I feel the difference in going wider zaps more power and mileage than going taller due to rolling resistance and drag. In these times, gas mileage is everything-- and living at high altitude, with a 4 or 6 cylinder, you need all the help you can get. I believe a set of siped 255/85 KM2's is in my future.

Jacket
07-25-2012, 08:52 AM
I had a set of 255 KM2's a while back, mounted on 16x7 steel rims. I think they measured around 33.2 tall brand new. I don't remember the width, but it seems like they were a tad bit more narrow than my Bighorns.

Caribou Sandstorm
07-25-2012, 09:51 AM
I had a set of 255 KM2's a while back, mounted on 16x7 steel rims. I think they measured around 33.2 tall brand new. I don't remember the width, but it seems like they were a tad bit more narrow than my Bighorns.


I agree Matt the Bighorns seem wider. Just looked up both. Bighorns slightly wider.

Bighorns 10.3
KM2s 10.0

Also don't forget depending on the width of the wheel, the tire may present wider, as well. I have these on 100 series rims, I think they are 8 or 8.5. The Bighorns have been ok so far, when aired down on trails on the wheels.

Also, and this point was evident to me anyway...Is that the 255s have a stiffer side wall vs a 285, so the bulge seems less, giving the tire a higher profile when aired up and aired down.