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Old 03-12-2013, 05:58 AM   #1
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tire guru needed

i have about 10k on my unit,80lbs in all tires per ford/goodyear stated rate on the chassis sticker. problem is both front tire show wear on the outside of the tires equeal on both tires inside and out, centre of tire is like new is this an inflation or alignment issue
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Old 03-12-2013, 06:03 AM   #2
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It could be both. The only proper way to set inflation is weighing the coach preferably each corner but at least each axle.
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Old 03-12-2013, 07:46 AM   #3
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Have tons of car & light truck experience here. Classic sign of under-inflation. We set all of our vans to maximum cold pressure for best mileage & performance. That is usually 65 or 80 psi, depending on the load range. On my MH I set them at 100 (max cold psi is 110).
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Old 03-12-2013, 08:00 AM   #4
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Larry is right.That is under inflation need to run more air. Check your sidewall and try just under max.
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Old 03-12-2013, 08:15 AM   #5
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If the Goodyear are G670. Then that is common with that tire.
Some call that rivering. No matter if the PSI is for the 4 corner weight or even a few pounds more.

You could change the wear on the old bias tires by changing the pressure.
Not so much on the new radial tires.

All 6 of my 22.5" G670's are wearing like yours. But will age out before ever getting down too the wear bars on the outside edges.
In 2 months mine will be 8 years old. I will replace them at 10 years or sooner if blow outs start to happen.
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Old 03-12-2013, 07:16 PM   #6
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Do the "chalk test." (Search on it)

I'm in a hurry this evening or I'd do it for you.

Edited: Found it. "You could also do the "chalk test." Take a piece of white chalk. Draw a line across the treads of each tire. Move the RV for a couple rotations of the wheels and then look at the chalk line. Just the center being rubbed off - to much air. Just the edges rubbed off - to little air. Rubbed off all across - just right. (so I have been told) (You an look at the chalk mark on the ground to see what the distribution is also.)"
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Old 03-13-2013, 01:48 AM   #7
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Quote:
Originally Posted by Triker56 View Post
If the Goodyear are G670. Then that is common with that tire.
Some call that rivering. No matter if the PSI is for the 4 corner weight or even a few pounds more.

You could change the wear on the old bias tires by changing the pressure.
Not so much on the new radial tires.

All 6 of my 22.5" G670's are wearing like yours. But will age out before ever getting down too the wear bars on the outside edges.
In 2 months mine will be 8 years old. I will replace them at 10 years or sooner if blow outs start to happen.
Rivering is generally not an even wear on the outer or inner tread patten. If you run your hands along the tread it goes up and down
The only way to solve this problem is to swap them to the rear. Dependent on the condition of the rear tires you may be just able to swap onto one side of the duals.
Then inflate as per tire chart - obviously more than current pressure.
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Old 03-13-2013, 02:03 AM   #8
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It can't be over stated, the only way to determine proper inflation pressure is by weighing your coach in as it is normally loaded/outfitted for travel.

You can get by weighing each axel but it much better to weigh each corner. Once the weights are known, use the tire manufacturer's chart to determine the proper pressure.

The "chassis sticker" does not take it to account the weight you added to your coach.

Running under inflated tires will at best shorten their life and could lead to a blow out.

If you can get corner weights they will also tell you how evenly your coach is loaded.
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Old 03-13-2013, 04:17 AM   #9
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I agree it sounds like classic underinflation. I would definitely get the coach weighed. It's really not a big deal (for me, it was 90% buildup of "are they going to tell me to get lost since I'm not a big rig?" and then turned out to be nothing with nothing... as easy as anything).

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Old 03-13-2013, 08:43 PM   #10
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Meanwhile, add at least 10 psi to those tires cause you are running dangerously soft. Then get to the weigh station, then look up the required pressure in the tire manufacturers inflation tables.
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Old 03-13-2013, 09:00 PM   #11
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The tread wear not much help on radial tires.

Could be alignment, ride height, wheels change angle with height ifs, so there are a few options
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Old 03-13-2013, 09:12 PM   #12
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Quote:
Originally Posted by sdennislee View Post
The "chassis sticker" does not take it to account the weight you added to your coach.
The sticker on the coach is for the MAXIMUM capacity of the axles with the original brand/size/model of tire and takes into consideration the weight of the rig and everything you've added, not as said above. That rating may be the actual rating of the tires/wheels/axle or braking capacity. It is the LOWEST of any of them.

It is only useful if you've never weighed the rig and need a starting point.
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Old 03-13-2013, 10:49 PM   #13
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The sticker on the coach is for the MAXIMUM capacity of the axles with the original brand/size/model of tire and takes into consideration the weight of the rig and everything you've added, not as said above. That rating may be the actual rating of the tires/wheels/axle or braking capacity. It is the LOWEST of any of them.

It is only useful if you've never weighed the rig and need a starting point.
My chassis sticker only considers the empty weight of the coach plus fluids.
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Old 03-14-2013, 08:54 AM   #14
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Quote:
My chassis sticker only considers the empty weight of the coach plus fluids.
The weight shown on the sticker is as you describe (the UVW), but I'll bet the tire pressures are for the axle GAWRs, which is the max axle capacity.
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