SargeW
Site Team
I have had my 32' Itasca Meridian for almost 3 years now and have just over 23,000 miles on the clock. I have never rotated the tires, but I pay close attention to the tread wear and pressures. A few days ago I got the idea to check the depth of the tire tread on each of the tires and compare it for wear. I have a simple tread gauge that has a probe on one end that goes into the tire tread, and the other is a marked gauge that pushes out depending on the tread depth. It is marked in 32nd's and millimeters. I used the 32nd side for my readings. I figured that if I checked a tire all the way across the tread face from outside to inside, if there was a significant difference in the depths of each tread it could indicate if the tire was running too high or too low of a pressure.
I was surprised (and pleased) to find that for the most part the tread depths were pretty even across all the tires. I was surprised to find that my front tires averaged between 12/32 and 13/32 in depth of remaining tread. The rears which I reasoned would have a little more tread since they are duals and only push the rig. Instead I found that the rears averaged between 11/32 and 12/32 of tread depth. Not a huge difference, but I always assumed that the front tires were taking a lot more punishment steering and taking 75% of the braking load. There was a slight decrease in depth in the inside of the rear inner duals, about 1/32, which I assume is due to the scrubbing of the inside tire when the rig turns a corner. Both side of the rears measured similarly, as did the fronts.
I'm not exactly sure how much tread that they had new, or how long they should last, but they still look to be in great shape and the ride is smooth. They are Michelin 255/80/22.5 XRV and are OE. I had a four corner weight done when I started to full time, and currently am running 95# in the fronts, and 85# in the rears, and that still leaves me with a good safety margin according to Michelin's weight charts. When I had the four corner weight done and compared it to Michelins weight chart, it indicated that I could actually run the fronts at 85# and still be within specs. However, I tried it for a 350 mile trip and the front end felt kind of "squishy" and wandered in the road grooves a little too much. I increased the the fronts to 95# and it corrected itself right away. I also have been using a Tire Pressure Monitoring System for about 2 years now, and wouldn't be without it. Great peace of mind. Just a little food for thought.
Sarge
I was surprised (and pleased) to find that for the most part the tread depths were pretty even across all the tires. I was surprised to find that my front tires averaged between 12/32 and 13/32 in depth of remaining tread. The rears which I reasoned would have a little more tread since they are duals and only push the rig. Instead I found that the rears averaged between 11/32 and 12/32 of tread depth. Not a huge difference, but I always assumed that the front tires were taking a lot more punishment steering and taking 75% of the braking load. There was a slight decrease in depth in the inside of the rear inner duals, about 1/32, which I assume is due to the scrubbing of the inside tire when the rig turns a corner. Both side of the rears measured similarly, as did the fronts.
I'm not exactly sure how much tread that they had new, or how long they should last, but they still look to be in great shape and the ride is smooth. They are Michelin 255/80/22.5 XRV and are OE. I had a four corner weight done when I started to full time, and currently am running 95# in the fronts, and 85# in the rears, and that still leaves me with a good safety margin according to Michelin's weight charts. When I had the four corner weight done and compared it to Michelins weight chart, it indicated that I could actually run the fronts at 85# and still be within specs. However, I tried it for a 350 mile trip and the front end felt kind of "squishy" and wandered in the road grooves a little too much. I increased the the fronts to 95# and it corrected itself right away. I also have been using a Tire Pressure Monitoring System for about 2 years now, and wouldn't be without it. Great peace of mind. Just a little food for thought.
Sarge