Excessive Tire Wear?

[Keith Hughes]

We did a trip out west last fall from western PA, north of Pittsburgh, traversing around 4200 miles while towing our 2021 3121RL fifth wheel up and through the Big Horn mountains and the Rockies. The RV did well but noticed unusual and excessive tire wear on the outside and inside edges of the tires creating a groove there. Except for the distance covered this trip and some of the mountainous terrain, there was nothing unusual about the trip. We were carrying our usual amount of cargo and kept the tires inflated at 110 psi which is the pressure we’ve been keeping them at for all our other trips. Was wondering if anyone would have any thoughts concerning what might have caused this – tire age (just past four years now), wheel bearing issues, suspension/alignment issues???

We plan to replace the tries given this wear and their age of four years even though the mileage on them is just shy of 18,000 and the tread depth is still fine. We’re probably replacing them with the same brand that are currently on the RV – Sailuns S637, ST235/80R16, 14 ply, G rated ones. Also, do you think the tires are still safe in their current condition? Pictures and location of each tire are posted. TIA!

[C&P RV]

I have this exact "wavy" wear pattern on my OE tires with about 22k miles on them. The date codes on my tires are 3721 and 4221. I reached out to Sailun's USA distributor asking for an adjustment under their warranty and was told to get the tires inspected by a "truck tire" dealer. That's on my list to do in the next couple of weeks as my Montana is in storage and with the holidays I haven't found the time to pull a tire and take it to a dealer. I have more pics but this one is the best from a lighting perspective. There was another post recently that showed similar wear - https://www.montanaowners.com/forums...ad.php?t=91934
Personally I feel like the tire has some type of defect in the way the belts were placed in the casing during manufacturing but its my opinion without a tire professional coming to the same conclusion. In my case the two tires in question are on opposite sides and different axles. My other two tires were replaced very early in their lifetime by Treddit because they were out of round. The replacements aren't showing this irregular wear (~10k miles on the replacements.)

[LeftOverParts]

We have the same exact wear on 3 of our tires. There was a post on this topic within the last couple months. My take away was that it’s normal and a number of folks mentioned it’s from tighter turns where the wheels tilt rather significantly due to the axles being on different turning radii, causing the tires to scrub the pavement.

That being said, it’s odd to me in our case anyway that 3 tires have it. When I did a bearing repack a couple weeks ago, I made sure there was no play in the wheel when the axle nut is finger tightened and locked down with the D washer. I noticed the D washer can allow the nut to turn slightly if the tangs aren’t bent well enough. Speculating and might be totally wrong but I was wondering if a slight amount of bearing play, could cause this type of tire wear. (During the repack, I found the bearings looked good and nothing unusual with them or the races. Smooth turning afterwards and none of the wheels got hot during our recent 700 mile trip.)

[Keith Hughes]

Thanks for the feedback!!