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Old 09-20-2021, 09:25 AM   #1
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Tiffin Owners Club
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Location: Nacogdoches, TX
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Front Tires Odd Wear Issue

I have 25,000 miles on my motorhome and yesterday in the campground I noticed that both front tires are wearing on the outside of the outside tread. The whole outside tread is not wearing; just the outer part of that tread, on both front tires. It looks like some wear is on the inside portion of the tire, but the wear is most evident on the outside section of the tires.
My actual front axle weight is 7,920 lbs. and the capacity is 9,000 lbs.
I run 80 lbs. pressure in the front tires - chart says I can run 70 lbs.
Tires are Michelin 255/80R 22.5 GXRV.
Alignment was done at about 5,000 miles, and King Pins were replaced at about 20,000 miles (do not know if it was realigned then or not).
We do drive in the mountains a lot on winding roads.
I have Centramatic tire balancers front and rear.

Any suggestions or advice? When I finish my current trip I will take it to the Ford Truck Shop for some scheduled maintenance.
Thanks,
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2018 Tiffin Allegro Open Road 32SA, Ford F53 24K Chassis
2012 Jeep Liberty
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Old 09-20-2021, 03:08 PM   #2
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Ford Super Duty Owner
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Location: Lowell, Arkansas
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Wade,
If a shop changed the king pins and didn't align the front end that's a sure sign they don't know what they are doing. It is or should be required after king pin change because it is a suspension/steering part.

What's the toe setting?? You don't know because nobody has checked it or set it recently. "REMEMBER PLEASE"

There are ONLY 3 reason for an alignment. Read that statement again.

1. The last shop that aligned the vehicle didn't do it correctly or at all.
2. You or somebody hit something and bent a steering/suspension part.
3. You have some worn parts like: tie rods, king pins etc.

That's it!!!!! Nothing as far as alignment angles will change unless one of those 3 reasons.

Tire wear outside is related to the toe adjustment. The toe angle is strange. We need our tires toed in abut 1/32" of an inch per side for a total toe of 1/16". In fact it should be ZERO but it is set to toe in because as steering parts wear after 20,000 or 40,000 miles the tires will toe OUT causing outside tire wear. If we start with a very sight toe in we can drive for many miles and not see much or any tire wear. More miles and worn parts and the wear increases. We see more outer tire wear.

Camber on an f-53 chassis is another strange angle. It is a tire wear angle. It's the tilt of the tire in or out from the top as seen facing the hub cap side of the tire. It is set at the factory because to change it the axle has to be bent COLD using chains and hydraulic jacks. Most shops won't touch it. All most of us can do is live with bad camber and hope ford will step up and replace the axles. Not likely!!!!

Camber tire wear can be on either side if it is changed from factory specs. You'd have t hit a big bump to bend the axle and change camber.
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Old 09-20-2021, 04:15 PM   #3
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Thanks TeJay. I will have it aligned when I take it in for other maintenance when I get back home, which will be this weekend. Evidently it was not aligned after working on the king pins.
I have about 400 more miles to drive before it gets to the shop. Will it help any to increase the air pressure to about 90 lbs. in the front tires?
Thanks,
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2018 Tiffin Allegro Open Road 32SA, Ford F53 24K Chassis
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Old 09-20-2021, 10:20 PM   #4
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Wade,
It might take some pressure off the tire edges if you filled them up to maybe 90+. That will make the ride harsh. It really depends on how old the tires are. If they are close to the 7-8 years mark you could take the worn fronts off after you get home and put them in the back bringing some less edge worn tires to the front steer tires. That will give you more time.

Putting the front worn tires on the back and they will wear all across the tread. At that point the worn edges won't matter very much.
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