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Old 08-08-2011, 12:38 PM   #1
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weird wear on BFGs

I happen to pride myself on tire issues, I haven't had a flat tire in nearly 25 years, keep my pressure up around 36psi, (depending on load) air down for the trail to around 18psi, and have always, very easily, gotten 50,000 miles and more out of my Michelin, Goodyears, or BFG MTs, ATs and street tires on all types of vehicles, from F250's, to Euro sedans, and jeeps. HOWEVER !! I purchased these BFG MT KM's, These tires are considered by many to be the benchmark of Mud Terrain tires. I am spring lifted 1.75", with an additional 1/2" up front to level off for the winch, and am running 255/85/16s, ( 33x11.5 ). There is about 24,000 miles on these tires. The inside tread blocks, on what was the front tires, are wearing down much faster than the center and outside blocks. The wear is smooth, no cupping or ripping, just down smooth. I noticed it after my last trip out west, as I didn't get them rotated till 6,000 miles. I have since dumped my wire winch line, and the heavy roller fairlead, for synthetic line, and aluminum fairlead, which gets rid of about 30lbs off the front bumper. I'm hoping this does the trick. Alignment is good, and I'm not drifting around on the highways. Maybe, just maybe, I got a bad set of tires from BFG. Any Ideas??

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Old 08-08-2011, 12:45 PM   #2
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I am sure more people will chime in---it sounds as if you have thought most of this through fairly well----only GUESS I have is TP a little high? and causing the tire to push to the inside on corners? A lot of people only run about 26-28psi on the street since the Jeep is so light. I am sure 25 years of experience is a good bench mark but just wondering about the weight of the Jeep in reference to other vehicles you have had.

Would like to know the outcome as I have BFGs (though smaller) and OME lift.

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Old 08-08-2011, 12:48 PM   #3
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I'm pretty sure 36 psi Is high for an 11" wide tire... I run 30-32 on a 9" tire and I have heavy front and rear bumpers with a warn 9000i on the front and a tire swing on the rear, not to mention a fully loaded tool box and recovery gear that never leaves what little trunk space I have...
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Old 08-08-2011, 01:05 PM   #4
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I'm pretty sure 36 psi Is high for an 11" wide tire... I run 30-32 on a 9" tire and I have heavy front and rear bumpers with a warn 9000i on the front and a tire swing on the rear, not to mention a fully loaded tool box and recovery gear that never leaves what little trunk space I have...
True,, I am well laden as well, full time tools, floor box in rear instead of seat, and dragging the trailer on long camping trips, I get that, but if I'm over inflated wouldn't the center lugs wear first? Not questioning your answer, just need a little clarification. I'll be the first to admit that I may need to learn something new, so all the info I can get I'm on it.
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Old 08-08-2011, 01:22 PM   #5
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Check the toe in... and yeah, I think the psi might be a few lbs. high, but don't know if that is contributing to the uneven wear.
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Old 08-08-2011, 02:22 PM   #6
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I'd get your camber adjustment checked. Sounds like you have positive camber set-up which is great for the track, but not so good for the trail.
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Old 08-08-2011, 03:26 PM   #7
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I'd get your camber adjustment checked. Sounds like you have positive camber set-up which is great for the track, but not so good for the trail.
camber adjustment on a solid axle? wouldn't that involve heating up the axle tubes and bending them? LOL I'm checking the toe tomorrow, I always thought toe problems would cause a lot of cupping. I've also reduced my air pressure down to 30 psi. Still learning..... anyone have a good used BFG MT KM 255-85-16 ?
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Old 08-09-2011, 11:01 AM   #8
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OK,,,,, just finished measuring my toe - in, per the Stu Olson Method,,,, criminy,,, the front of the tires measured 59 and 2/16" apart and the rear of the front tires is at 59 and 15/16ths apart,, thats nearly an inch of toe in..... So much for trusting my local alignment shop that says he specializes in 4WD........ Can every one agree that my toe in should be no more than 1/8" with 33's ??
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Old 08-09-2011, 02:43 PM   #9
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camber adjustment on a solid axle? wouldn't that involve heating up the axle tubes and bending them? LOL I'm checking the toe tomorrow, I always thought toe problems would cause a lot of cupping. I've also reduced my air pressure down to 30 psi. Still learning..... anyone have a good used BFG MT KM 255-85-16 ?
LOL. I knew the axle was solid but didn't think about no camber adjustment or no constant velocity joints. This will be my first vehicle that hasn't had camber adjustment so just assumed every vehicle had this facility.

Oh well, you learn something new each day.
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Old 08-09-2011, 02:52 PM   #10
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Check the toe in... and yeah, I think the psi might be a few lbs. high, but don't know if that is contributing to the uneven wear.
Agreed on the immediate need for alignment check. Your Jeep may just need the wheels aligned, but the misalignment might also be due to sagging springs, worn ball joints, or worn control arm bushings -- so get those checked out, too.

High tire pressure would normally cause abnormal wear in the center of the tread width, so I don't think that's playing a role.
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Old 08-09-2011, 02:54 PM   #11
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Agreed, 1/16 to 1/8 toe. I run 30 psi on the street with 33x10.50 BFG MTs on 15x7" wheels. Getting even wear, 25K miles with about 1/2 tread left.
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Old 08-09-2011, 02:58 PM   #12
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LOL. I knew the axle was solid but didn't think about no camber adjustment or no constant velocity joints. This will be my first vehicle that hasn't had camber adjustment so just assumed every vehicle had this facility.

Oh well, you learn something new each day.
You can get shims for them and shim them out, but it is a very rare case indeed that shimming is ever needed, unless mayber your'e running 37s' or something way big....

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