post your true tire diameters
01-05-2017, 09:48 AM
#31
Sorry to breath New life to an old post.
255/75r-17 Goodyear Wrangler MTR on OEM 17x7.5 31.75" in diameter ( Flat board laid on on tread and measured to level ground)
255/75r-17 Goodyear Wrangler MTR on 17x9 ARE ATX 194 Ravine Part # AX19479050612N 31.50 in diameter.
255/75r-17 Goodyear Wrangler MTR on OEM 17x7.5 31.75" in diameter ( Flat board laid on on tread and measured to level ground)
255/75r-17 Goodyear Wrangler MTR on 17x9 ARE ATX 194 Ravine Part # AX19479050612N 31.50 in diameter.
01-05-2017, 03:14 PM
#32
JK Super Freak
Join Date: Apr 2008
Location: Thunder Bay, Ontario
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35x12.50x17 Pitbull Rockers - actual 35"
37x12.50x17 Pitbull Rockers - actual 37.115"
For calibrating you speed.
Measure from hub center to ground double it and use this number to program
Confirm with GPS.
I have done it this way for years and it is alway right on or as close as possible. Some programmers adjust tire size in 1/4" increments.
37x12.50x17 Pitbull Rockers - actual 37.115"
For calibrating you speed.
Measure from hub center to ground double it and use this number to program
Confirm with GPS.
I have done it this way for years and it is alway right on or as close as possible. Some programmers adjust tire size in 1/4" increments.
The following users liked this post:
Montego (02-27-2022)
01-05-2017, 03:18 PM
#33
JK Junkie
Mastercraft Courser MTX
37X12.50 on 17" Wheel 8.5" wide and 4.5" backspace
36.1" Measured and calibrated with GPS
Toyo's and Nitto's as well as Pitbulls run more true to size than other brands.
*Edit* Forgot to add I Run 21 PSI thats where I get the best wear
37X12.50 on 17" Wheel 8.5" wide and 4.5" backspace
36.1" Measured and calibrated with GPS
Toyo's and Nitto's as well as Pitbulls run more true to size than other brands.
*Edit* Forgot to add I Run 21 PSI thats where I get the best wear
Last edited by Jonathan_JK; 01-05-2017 at 03:21 PM.
01-17-2021, 03:14 AM
#34
well, my interest was more about the values on an unmounted tire, in order to have data as clear as possible,
especially for people interested in upgrading to big and heavy sizes, anyway
here data sorted
hope it helps
BF Goodrich
All-Terrain KO2
Discoverer S/T Maxx
Rocky Mountains
SL366
Duratracs
Dynapro MT
Courser MXT
Buckshot Mudders
MTZ
FT-9
Terra Grapplers
Rockers
Xtremes MT/2
Open Country A/T II
especially for people interested in upgrading to big and heavy sizes, anyway
here data sorted
hope it helps
BF Goodrich
All-Terrain KO2
- 315/70 r17
@ 28psi on ?.?s -> 33.50" (by donjuan79)
Mud-Terrain KM2s- 255/75 r17
@ ??psi on ?.?s -> 30.75" (by metaldemon)
- 285/75 r17
@ 32psi on 7.5s -> 33.25" (by TJJK)
- 35x12.50r17
@ 30psi on 8.5s -> 33.50" (JKUR) (by TxJeepers)
- 35x12.50r17
@ ??psi on 9.0s -> 33.75" (by Trev8908)
CooperDiscoverer S/T Maxx
- 255/80 r17
@ 35psi on 7.5s -> 32.25" (by unlimited12)
FalkenRocky Mountains
- 37x?????r??
@ ??psi on ?.?s -> 36.70" (by familytime)
GoodrideSL366
- 37x12.50r17 31.9kg/70.3lb -> 36.77" JUST TIRE (by syr)
@ 21psi on 9.0s -> 35.95" (by syr)
GoodyearDuratracs
- 255/80 r17
@ 35psi on 7.5s -> 32.25" (by espi)
- 285/70 r17
@ 33psi on 8.5s -> 32.50" (by espi)
- 285/70 r17
@ 29psi on 8.5s -> 32.00" (JKU) (by espi)
- 315/70 r17
@ 30psi on 8.5s -> 33.50" (by JoeRaj)
- 315/70 r17
@ 32psi on 9.0s -> 33.50" (JKUR) (by TxJeepers)
Wrangler MT/R kevlar- 37x?????r??
@ 28psi on ?.?s -> 36.75" (by jeeperjkjeeper)
Wrangler MT/R- 255/75 r17
@ ??psi on 7.5s -> 31.75" (by Spartan65USMC)
- 255/75 r17
@ ??psi on 9.0s -> 31.50" (by Spartan65USMC)
HankookDynapro MT
- 315/70 r17
@ 34psi on ?.?s -> 34.05" (by JKRescue08)
Mastercraft Courser MXT
- 37x12.50r17
@ 21psi on 8.5s -> 36.10" (by Jonathan_JK)
Maxxis Buckshot Mudders
- 285/70 r17
@ ??psi on ?.?s -> 32.00" (by pablorg)
Mickey ThompsonMTZ
- 315/70 r17
@ 30psi on ?.?s -> 34.00" (by GJeep)
NankangFT-9
- 35x12.50 r17 29kg/63.9lb JUST TIRE
@ 35psi on 9.0s -> 34.80" UNMOUNTED (by syr)
Nitto Terra Grapplers
- 315/75 r16
@ 37psi on 8.0s -> 33.75" (likely smaller)(JK) (by John.M)
Ridge Grappler- 285/75 r17
@ 40psi on 8.5s -> 33.86 (34'') (by OscarMlke)
Pitbull Rockers
- 35x12.50r17
@ ??psi on ?.?s -> 35.00" (by jtphoto JK)
- 37x12.50r17
@ ??psi on ?.?s -> 37.115" (by jtphoto JK)
Pro CompXtremes MT/2
- 315/70 r17
@ ??psi on ?.?s -> 33.25" (by mikestoick)
ToyoOpen Country A/T II
- 285/70 r17
@ 32psi on 7.5s -> 32.00" UNMOUNTED (by jadmt)
@ 32psi on 7.5s -> 31.??" (by jadmt)
- 285/75 r16
@ ??psi on 8.0s -> slightly taller (by jadmt)
- 285/75 r17
@ 28psi on 7.5s -> 33.00" (by jadmt)
Open Country M/T- 285/75 r17
@ 28psi on ?.?s -> 33.50" (by CAELBLUE1)
Last edited by syr; 01-27-2021 at 11:52 PM.
01-27-2021, 07:52 AM
#37
JK Enthusiast
BFG KO2 315/70R17 C load range
I’ve measured these up at 33.5 at 28 psi.
At 32-35 psi they’re about 33.75
When using the Superchips flashcal and a Garmin GPS to verify I had to set it to 33.25 to make the speedo match the GPS. Can’t speak to weight as I never weighed them, but as far as getting weight specs Tire Rack has every weight listed, even for the KO2s which aren’t listed on BFG’s website.
At 32-35 psi they’re about 33.75
When using the Superchips flashcal and a Garmin GPS to verify I had to set it to 33.25 to make the speedo match the GPS. Can’t speak to weight as I never weighed them, but as far as getting weight specs Tire Rack has every weight listed, even for the KO2s which aren’t listed on BFG’s website.
01-28-2021, 12:01 AM
#39
Added thanks
you are right, but gets tricky to objectively measure it, anyway, if we define a way, I can update the post 