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Old 11-26-2022, 07:57 PM   #1
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Front End Alignment

I have experienced some very unusual tire wear (FL XC chassis) following my trip to Alaska this summer. My tire dealer tells me that the only front end adjustment is for toe. Is this really the case… caster and camber are off the table?
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Old 11-26-2022, 10:46 PM   #2
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I don't know about newer XC chassis, but my vintage chassis (solid axle, not IFS , Independent Front Suspension) toe is the only adjustment.

Camber would require bending the axle.
Caster is affected by ride height and has more to do with handling than tire wear.

Do you still have the tires, so you could post a picture of the wear?
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Old 11-26-2022, 11:49 PM   #3
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Here are some pics of the tire wear. You can see the irregular wear/thickness in that center rib. Also, note the severe outer shoulder wear with flat spotting. Same kind if wear, although less, on the inner rib.
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Old 11-27-2022, 08:22 AM   #4
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https://business.michelinman.com/tip...-tire-wear-101
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Old 11-27-2022, 08:43 AM   #5
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When I bought my coach in 2008 I had tire wear similar to what your pictures show but not as bad. Also had a bad vibration in the front end. Rig had ~50K miles on it.

So I knew I needed new front tires and needed to have my alignment checked but where. So I called Buddy Greg of Knoxville and tried to make and appointment there but they didn't do alignments, OK "so where do you take big rigs when they need an alignment" and they gave me the name of an alignment ship. I made an appointment.


Got new tires put on and took it right to shop. The shop owner got in the shop right away and checked and came in and told me he had to bend the solid front axle. I gave the go ahead and they pulled out a big cast mechanism that the rigged up the the axle with heavy chains and used a hydraulic ram to bend the axle. Not sure if they had to do it twice.

But when the were done there was no front end vibration and the tires wore evenly side to side. Got ~55K miles on the tires but had to change because they were aged out.

So if you can find a good shop that knows what they are doing and say the have to bend the axle consider letting them do it. I did
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Old 11-27-2022, 09:59 AM   #6
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Quote:
Originally Posted by Cuda67bnl View Post
Great site.

As per the wear pattern and cause descriptions in the pictures from the OP and the site, suspect tire inflation and possible shock absorber problems over toe in and camber issues.
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Old 11-27-2022, 10:03 AM   #7
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Alignment changes on solid front axle:


Toe-- easy adjustment by turning (lengthening/shorting) the tie rod


Caster-- wedge shaped shims between chassis and axle. Also materially affected by ride height, so check ride height first.


Camber-- only changed by bending axle.
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