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Old 12-24-2015, 09:08 AM   #15
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Quote:
Originally Posted by tomakat View Post
Here are some pictorial examples of tire issues and potential causes:

Very helpful! Thankyou!
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Old 12-24-2015, 09:09 AM   #16
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Quote:
Originally Posted by Gary RVRoamer View Post
I would be skeptical. Worn shocks can let the tire bounce a lot, which causes something called "cupping", round or oval spots where the tread is more worn that the surrounding tire surface. There will be multiple of these shallow spots around the circumference of the tire. It does NOT cause a uniform "rounded" effect. If the tire is rounded, meaning higher in the center than both edges, that indicates over-inflation. If only one edge is lower than the rest, it indicates a front end alignment problem.

These pictures and brief explanations may help:
Tire Tread Wear Patterns: Pictures | Causes

Thankyou!
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Old 12-28-2015, 01:26 AM   #17
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Replace, replace and did I say replace. You are driving a coach with a ticking time bomb. BTW I was just in McKinney in Oct. I grew up there. That's God's country.
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Old 12-28-2015, 09:30 AM   #18
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we are looking to buy our first and hopefully only RV but with over 4 million miles over the road I will echo the "replace" posters. There are 2 items I never go cheap on or try to stretch out use on...steer tires. Definitely do the replace along with complete front end alignment, replacing any worn parts as needed. New shocks at this time would also be advisable. I had a steady run to Dallas for years. I can't remember the name of the alignment shop in Irving area I would use but I think it was Lone Star. Check with the local Freightliner dealer, at that time they used the same company. good luck
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Old 12-29-2015, 01:32 PM   #19
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Just replaced the Monroe shocks that were original with 37k miles on them with Bilsteins. Im now driving a (feels like) new coach. What a positive difference in ride and handling it made. Well worth the $ to replace 8 of them.


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Old 12-29-2015, 08:29 PM   #20
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Tires and shocks

Gfda
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Old 12-30-2015, 06:00 PM   #21
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I prefer the KONI FSDs. A little more money but worth it.
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Old 12-31-2015, 02:17 PM   #22
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When I got my coach it had 17000mi on it and 295/80R22.5 Goodyear tires but they were 8 years old and had side wall cracks. The first thing I did was to get 6 Michelin tires through FMCA at a cost of $4200 Mount, balanced. I just had a full set of KONI SP3 installed at OMC in Junction City, what a difference in the ride. I run 105psi in the front and 100psi in the rear and I have had a 4 corner wt done at a FMCA rally well worth the money.
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Old 03-27-2016, 07:21 PM   #23
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Originally Posted by GN2ZDGS View Post
Thanks - overall the tires are in great shape, but I will have them carefully inspected. Its kept at 100lbs psi and max for this brand of tire is 120psi.

I may need to find a reputable company. There is a Michelin dealer near me - maybe they can analyze for me?
My tires have 120 max stamped on them and I run the steers at around 85 psi and the duallys at 80 so your coach tires being at 100 psi with 120 max stamped on the tire indicates nothing. Weighing the coach and looking at inflation charts will give you the reccomended psi.
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Old 03-27-2016, 07:25 PM   #24
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Quote:
Originally Posted by Monacoach View Post
My tires have 120 max stamped on them and I run the steers at around 85 psi and the duallys at 80 so your coach tires being at 100 psi with 120 max stamped on the tire indicates nothing. Weighing the coach and looking at inflation charts will give you the reccomended psi.
The pressure on the sidewall of a Michelin RV tire and many others is not the "Maximum" the tire should ever have (unlike car tires) it is the minimum to support the maximum rated carrying capacity of the tire.

From the Michelin RV Tire Guide:
Quote:
"If you look at the tire's sidewall, you'll see the maximum load capacity allowed for the size tire and load rating, and the minimum cold air inflation needed to carry the maximum load."
From page 6 of the GoodYear RV Tire and Care Guide:
Quote:
"How much air is enough?
The proper air inflation for your tires depends on how much your fully loaded RV or trailer weighs. Look at the sidewall of your RV tire and youíll see the maximum load capacity for the tire size and load rating, as well as the minimum cold air inflation, needed to carry that maximum load."
From TOYO:
Quote:
Q: What are the consequences of inflating the tires to accommodate the actual loads?
A: If the inflation pressure corresponds to the actual tire load according to the tire manufacturerís load and pressure table, the tire will be running at 100% of its rated load at that pressure. This practice may not provide sufficient safety margin. Any air pressure loss below the minimum required to carry the load can result in eventual tire failure.
But then they go ahead and publish a weight/pressure chart allowing lower pressure for RV's!!

From the August 2010 Motorhome Magazine "Tread Carefully" tire article:
Quote:
The maximum load capacity allowed for the size tire and load rating and the minimum cold air inflation needed to carry that maximum load are located on the tireís sidewall.
From our owners manual:
Quote:
Federal law requires that the tireís maximum load rating be molded into the sidewall of the tire.
If you look there, you will see the maximum load allowed and the cold air inflation pressure required to carry that stated maximum load. Less air pressure restricts the tire to carry a lighter load.
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Old 03-29-2016, 07:35 PM   #25
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So - after nearly 3 months of a broken knee (and not even walking yet) I'm back to trying to fix my tire situation. I'm going to go ahead and replace all 6 of them. I currently have Michelin XZA3 on there and thinking of updating with the same and also replace the original shocks. I do have FMCA discount available to me - just wondering, if before I pull the trigger on $5k worth of tires and more for shocks, if there is another quality brand/tire I should look at?
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Old 03-29-2016, 08:02 PM   #26
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I went with 6 Bridgestone R250 ED tires for $3532.46 out the door including balancing all six of them. I couldn't be happier with the improved ride and steering control over my old Goodyear tires.
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Old 03-29-2016, 08:12 PM   #27
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I would look at any brand other than Michelins. Michelins are way over rated and exceptionally over priced. Also famous for sidewall cracks at a very young age.
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Old 03-29-2016, 08:14 PM   #28
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Forgot to include a cost breakdown I did when looking for my tires. All prices were in Lexington Ky area and current as of January 15, 2016

Don't forget Costco and Sams Clubs, They seemed to have the best prices however my Costco could not install tires that big. Some stores can and some cannot.

Costco (no installation)
Michelin
XZA2 or XZE2+ $3,516.62 or $586.10ea

Bob Sumerel Tire
Bridgestone R250 $4,214.34 or $702.39ea
Continental $3,890.00 or $648.33ea

S & S Tire
Bridgestone R250ED $3,532.46 or $588.74 ea
Michelin XZA2 $4,637.60 or $ 772.93 ea
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