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Old 07-28-2021, 09:28 AM   #1
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Tire wear question

33í Class A on F53 chassis with 25k miles. Overall the RV drives pretty well, with no noticeable pulling or wandering. The outside tread of all tires appear to be wearing.

I plan to bring it in for an alignment but Iím a new owner and Iíll be going to a shop that Iím not familiar with so Iíd like to try and educate myself before hand.

Is this kind of wear normal?

Sorry about the pictures, I can't figure out how to reorder or annotate them. They are in order: Passenger side steer, Rear Driver, Driver side steer and Rear Passenger
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Old 07-28-2021, 09:37 AM   #2
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Underinflation is a good possiblity.
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Old 07-29-2021, 07:15 AM   #3
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Originally Posted by rjwilliams View Post
Underinflation is a good possiblity.
I had the same thought before seeing your reply. I always go by the sticker by the door and not a lower number based on weighing the coach unless the center is wearing faster.
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Old 07-29-2021, 02:04 PM   #4
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I had the same thought before seeing your reply. I always go by the sticker by the door and not a lower number based on weighing the coach unless the center is wearing faster.

Why wouldn't you go by the load inflation charts that are designed by tire experts to provide the best traction, control and wear?
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Old 07-29-2021, 02:16 PM   #5
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Bryan,
The fronts are "toed in" so alignment will fix this.
Have your tire shop turn the fronts inside out on the rim.
Throw in balance beads when they are open. You will never regret it.

The duals are low on air. Kick the pressure up 10 lbs from where you are now.
Monitor the results and report back on how they are wearing.

Clean a spot on the duals and put duck tape across the tread, and take a short drive. Check the tape for uneven wear.

Mike in Colorado
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Old 07-29-2021, 03:37 PM   #6
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First of all, you don't have a significant problem with any tire. Fronts could benefit from an alignment and rears are probably slightly underinflated, but you could probably drive those tires until they age out (7-10 years) before the wear became a problem. Flyer15 gave advice for optimal tire life, but I'd just have fronts balanced and aligned, and check the pressure in the rears vs the tire placard recommendation. And sleep well at night!
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Old 07-29-2021, 04:33 PM   #7
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Hmmm, those are Michelin steer tires. The outside of the tread is slick like that. Measure tread depth across the tire before you decide you have a problem.
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Old 07-29-2021, 04:54 PM   #8
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Originally Posted by Gary RVRoamer View Post
First of all, you don't have a significant problem with any tire. Fronts could benefit from an alignment and rears are probably slightly underinflated, but you could probably drive those tires until they age out (7-10 years) before the wear became a problem. Flyer15 gave advice for optimal tire life, but I'd just have fronts balanced and aligned, and check the pressure in the rears vs the tire placard recommendation. And sleep well at night!

Correct. Looks like a toe in problem.
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Old 07-29-2021, 10:58 PM   #9
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You guys are like tire whisperers . Thanks. Iíll add a balance to the alignment. Also found that the local tire shop can do 4 point weighing so Iíll get that taken care of also (and see how far off I was approximating).
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Old 07-30-2021, 01:30 PM   #10
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Why wouldn't you go by the load inflation charts that are designed by tire experts to provide the best traction, control and wear?
If you are using the chassis maker's specified tires, you will find that the tire maker's chart will exactly coincide with the chassi maker's sticker inflation at the GAWR for each axle. Unless you are running well under your GAWRs, which is doubtful, you will not be much different. It is better to be overinflated than under inflated and I seriously doubt that people change tire inflation for changes in amounts carried in fuel, water, and sewer tanks.
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Old 07-30-2021, 06:55 PM   #11
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Please report back on the four point weighing. Remember that you may not have it fully loaded, so add ten psi to the recommended pressure on the load pressure chart for your tires. I do and never need to adjust them unless it gets to be within five psi of the recommended pressure. That way cold mornings, hot days, and altitude changes do not require pressure adjustments.
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Old 07-30-2021, 11:56 PM   #12
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If you are using the chassis maker's specified tires, you will find that the tire maker's chart will exactly coincide with the chassi maker's sticker inflation at the GAWR for each axleÖ.
The sticker called for 90# on all tires and which does match Michelins load recommendations assuming full weight on all axles. I was originally running at 110 on steers and 100 on the rears based on the dealerís recommendation (bought used). The ride was rough as heck. So I dropped it down to 95 on steers and 90 on the rears but I think thatís when the wear started to show. Weíll see what the tables call for once i get it weighed and how they wear after itís aligned.
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Old 07-31-2021, 06:43 AM   #13
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Originally Posted by Teamfoxy View Post
If you are using the chassis maker's specified tires, you will find that the tire maker's chart will exactly coincide with the chassi maker's sticker inflation at the GAWR for each axle. Unless you are running well under your GAWRs, which is doubtful, you will not be much different. It is better to be overinflated than under inflated and I seriously doubt that people change tire inflation for changes in amounts carried in fuel, water, and sewer tanks.
That may be true with some RV's, but not mine. My sticker called for 110 psi on all three axles. After weighing all six positions, I found that according to Michelins chart, I needed 115 on the steer, 85 on the drive, and less than 75 on the tags. So, by the sticker, I was underinflated on the steer and way overinflated on the rest. After adjusting to the correct chart pressures and 50,000 miles later, I had pretty even tire wear and a better ride. The manufacturers can be close some of the time, but the load/inflation chart is right ALL the time.
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Old 08-20-2021, 07:43 AM   #14
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Wanted to wrap this discussion up and pass on a little something I learned.

First of all. You all were correct. Problem was toe. On weight and tire pressure, the total vehicle weight was 18560 (all equipment, full fuel & water but without my wife & I, food or clothes). LF = 3840, RF = 3380, LR = 5500, RR = 5840. They set the tires at 95# on front and 85# on back. Which gives us plenty of room for the extra weight.

Helpful tip: Apparently Michelin sizes are proprietary. So when you ask for sizes off your Michelin tires (eg 235/80R22.5/14 on mine) the brand that can match that size is Michelin. If you want to look for other near equivalent options you'll need to specifiy a different size. For mine it would be 245/75R22.5/14

Thanks again for all the help.
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