Tires

Topic: Tires (Read 9729 times) previous topic - next topic

Re: Tires

Reply #125 – April 06, 2017, 10:09:42 am

Mike,

Tire documents for UniRoyal, see page 21 for inflation chart.

https://www.michelinb2b.com/wps/b2bcontent/PDF/UNI_DataBook_E.pdf

Re: Tires

Reply #126 – April 06, 2017, 12:57:01 pm

My size isn't listed.

Re: Tires

Reply #127 – April 06, 2017, 01:12:45 pm

For the 275/80R 22.5 LRH. Use the 11R22.5 chart.

Re: Tires

Reply #128 – April 06, 2017, 02:10:03 pm

I see our Michelin XRV 255/80/R-22 were replaced in late '13, can't find the mileage, but the files show she only made a couple of trips in home state Arizona only until we bought her in late '14. So, I'm thinking 3k, was weighed and runs 82psi all around. Look brand new and track perfect! I've never used canvas covers on any of our coaches; instead, use "No Touch" spray. My files show our version of the tire, in the brochure, is "highway tread/summer". Which means to me if I was going back up north, these tires would not be suitable. Something to consider when buying fresh!

Re: Tires

Reply #129 – April 06, 2017, 03:07:49 pm

We made a winter trip to Yellowstone and then Detroit a couple of years ago. We all piled in the RAV4 for the trip as I didn't want to drive the U300 on salted roads. Nearing Yellowstone, there were a flock of Bighorn Sheep blocking the highway. After passing through them, I asked the ranger station why the normally rare to see sheep were down on the road. His answer was that since that highway was just outside the park, the highway department salted the road and that attracted the sheep.

Having just installed a new chrome hitch ball in California, I was very surprised to see it was completely rusted when we arrived in Detroit. Since we all know we don't have the most rust resistant undercarriages on our coaches, it does not seem to be wise to intentionally expose our pride and joys to road chemicals. Since it's not really possible to fit chains to our tires, it seem doubly unwise to temp fate in winter.

Now and again, we drive in heavy rain. Our highway tread/summer tires have never hydroplaned or caused any anxiety on or off road.

Pierce

Re: Tires

Reply #130 – April 07, 2017, 12:35:41 am

Quote from: Roger & Susan in Home2 – April 06, 2017, 10:09:42 am

Mike,

Tire documents for UniRoyal, see page 21 for inflation chart.

https://www.michelinb2b.com/wps/b2bcontent/PDF/UNI_DataBook_E.pdf

I saw this online but wondered about the 11R22.5...figured this was probably the chart I was looking for but not exact size. I am 9500ish on front. Will prob stay with 95-100 psi for safety sake. Like I said, the ride with 120 psi was not disagreeable, so any less pressure would be a bonus. 👍 Thanks Roger

Re: Tires

Reply #131 – April 07, 2017, 01:19:08 am

We had an 11R22.5 for a spare but it's not a viable option for anything. It's about an inch taller and will do more than polish the front airbag flanges.

Our 295/75's get nothing but 110psi cold. No ride problem.

Pierce

Re: Tires

Reply #132 – April 07, 2017, 09:58:00 pm

Ride comfort should not be the only criteria. Contact patch size is critical.

Re: Tires

Reply #133 – April 07, 2017, 10:22:31 pm

Was up at OTM last week getting my transmission oil changed. Mentioned to Wayne [ex. FOT alignment guy] that my coach was wandering and I had to make constant corrections, when on roads with a little crown. He glanced under the wheel well and said he had aligned it before. He then asked what my tires had in them. I said 100 psi. Had a cat weigh slip with me, he looked at it and said try 75 psi all around. Seemed too low, so I tried 85 psi. Big, Big improvement. My coach is pretty light at 27500 fully loaded. Better ride too, do not feel every tar strip anymore.

Re: Tires

Reply #134 – April 07, 2017, 10:54:26 pm

Wayne made the same changes when we had a alignment. He lowered the pressures from the chart to what he felt was right. Three years later the tires were shot. I will never let anyone talk me out of following the manufacturers load/pressure chart again.

Re: Tires

Reply #135 – April 07, 2017, 10:56:39 pm

Our PO put LRG tires on the coach. When we had it weighed , all four corners with proper coach loads, at the 2015 GV we were right at the limits of the LRG in the front. We switched to LRH last summer and adjusted air pressure for the maximum load on each axle plus 5 psi. Better ride, better handling especially in cross winds. 75 psi even in an empty coach just seems too low to be safe.

Ours weighs closer to 32K, longer, bigger motor, bigger transmission, slide. 95 rears, 105 front.

Re: Tires

Reply #136 – April 07, 2017, 11:00:03 pm

Quote from: flite2010 – April 07, 2017, 10:54:26 pm

Wayne made the same changes when we had a alignment. He lowered the pressures from the chart to what he felt was right. Three years later the tires were shot. I will never let anyone talk me out of following the manufacturers load/pressure chart again.

Actually I have goodyear 295/75/22.H's, and goodyear recommends 75 psi for my coach weight. I went 85 psi for a margin of safety.

Max Speed Inflation Pressure - PSI Goodyear spec's

75 80 85 90 95 100 105 110 115 120 125 130
S 4725 4940 5155 5370 5510 5780 5980 6175(G) 6370 6610(H)
D 4690 4885 5070 5260 5440 5675(G) 5800 6005(H)

Re: Tires

Reply #137 – April 08, 2017, 06:28:21 pm

We carry 100 all around and most of the time with temp and elevation changes, the tires are often closer to 95 when cold.

Standard comment from Wayne is to use much lower pressures all around, even though tire charts show closer to 100 if taking in consideration extra 10% for wind and cornering weight shifts + a safety margin.

We never follow Wayne's advice. We take safety over comfort. BTW we are riding on XZA3+ LRH.

Re: Tires

Reply #138 – April 08, 2017, 07:21:37 pm

Quote from: Barry & Cindy – April 08, 2017, 06:28:21 pm

We carry 100 all around and most of the time with temp and elevation changes, the tires are often closer to 95 when cold.

Standard comment from Wayne is to use much lower pressures all around, even though tire charts show closer to 100 if taking in consideration extra 10% for wind and cornering weight shifts + a safety margin.

We never follow Wayne's advice. We take safety over comfort. BTW we are riding on XZA3+ LRH.

Actually, Wayne's advice, 75 psi was exactly what the goodyear tire chart recommended for my coach weight, I added 10 psi more for safety. Checked tire temps at 100 psi and 85 psi and found little difference in temps, so obviously not wearing out the tire at lower pressures, and better handling and ride as well.

Re: Tires

Reply #139 – April 08, 2017, 07:47:07 pm

Mine are supposed to be 87, 97. At 32,000 actual load. Full fuel, water, stuff

Re: Tires

Reply #140 – April 08, 2017, 08:16:05 pm

After checking my notes, I'm 10,500 on the front (not 9500) and 17,100 on the duals full fuel, water and most "stuff". I figure no more than an additional 300 LBS of booze, ice, food and clothes (in order of importance 😉) so next trip out I'll try 100 in the steer and 85 on the back. Should have plenty of safety margin. My coach has a case of the wanders also, so maybe an air pressure adjustment instead of 2-3 CB's and 3 days in the pit will fix it. Had the same wander with the Mich's. Can't blame the new tires.

Re: Tires

Reply #141 – April 08, 2017, 08:20:34 pm

Quote from: Barry & Cindy – April 08, 2017, 06:28:21 pm

We carry 100 all around and most of the time with temp and elevation changes, the tires are often closer to 95 when cold.

I run 100 all the way around too. It's not too much PSI as the tires still flex some, visually. I have the crossfire equalizers on the rears at 100PSI. I don't think 10-15psi would give me that much smoother ride.

Re: Tires

Reply #142 – April 08, 2017, 08:46:35 pm

Jet Doc five psi is noticeable on tire pressures.

100 for your front axle weight seems high. Probably mid 80's

Especially if you are mentioning a wander issue

Re: Tires

Reply #143 – April 08, 2017, 08:48:57 pm

Quote from: Jet Doc – April 08, 2017, 08:16:05 pm

After checking my notes, I'm 10,500 on the front (not 9500) and 17,100 on the duals full fuel, water and most "stuff". I figure no more than an additional 300 LBS of booze, ice, food and clothes (in order of importance 😉) so next trip out I'll try 100 in the steer and 85 on the back. Should have plenty of safety margin. My coach has a case of the wanders also, so maybe an air pressure adjustment instead of 2-3 CB's and 3 days in the pit will fix it. Had the same wander with the Mich's. Can't blame the new tires.

You probably have inadequate toe in. The biggest reason for not tracking straight, especially on uneven roads.

Pierce

Re: Tires

Reply #144 – April 12, 2017, 09:21:30 am

I just had 2 new steers (Toyo) put on. I really like the way they feel when driving on narrow roads. With that said, it will take some time to see how they compare to the Michelins I had on. The tire tech told me that new tires should not be balanced internally or externally! News to me, however, he said that if the tire feels a little out of balance, the right way to get it right is to relocate tire on the rim. I brought the coach up to 80 to see and to my amazement, no shake, wobble. I learn something new everyday.

800.00 for 2 tires with mounting.

Re: Tires

Reply #145 – April 12, 2017, 11:00:28 am

That's a new one,thought about it for a while,if you try and balance by relocating the tire on the rim you would have to balance
the rim and the tire seperately.If you go by his reasoning and you "feel" a wobble then that means the tire itself is out of balance.
Just sounds very strange to me.Which Toyos did you get?

Re: Tires

Reply #146 – April 12, 2017, 11:41:44 am

Quote from: cubesphere – April 12, 2017, 09:21:30 am

I just had 2 new steers (Toyo) put on. I brought the coach up to 80 to see and to my amazement, no shake, wobble. I learn something new everyday.

80 what? PSI or MPH? If 80 psi, what did you start with? Seems very low to me. We have always run 110 psi in the 295s.

Pierce

Re: Tires

Reply #147 – April 12, 2017, 12:07:21 pm

John,
The Toyo's I put on mine were Toyo M177's, 295 75 22.5 H rated. Paid $400.00/tire in Sealy TX. Have not been on a real trip yet. Going to Kerrville Sunday for a week. Will give an update when we return.

John

Re: Tires

Reply #148 – April 12, 2017, 12:47:58 pm

Quote from: cubesphere – April 12, 2017, 09:21:30 am

The tire tech told me that new tires should not be balanced internally or externally! News to me, however, he said that if the tire feels a little out of balance, the right way to get it right is to relocate tire on the rim. I brought the coach up to 80 to see and to my amazement, no shake, wobble. I learn something new everyday.

Unless you're hauling the DWs rock collection, 82 psi is where we sit after being weighed. I do have files that show the PO bought these Michelins from some FMCA deal. The outlet, (not Bubba's tire store) charged them almost $700.00 after the "good deal".
I would have done the same thing; I made no mark-up/profit on the tires, so the force balance,/dismount/remount were charged for.
Yes, extras were new aluminum valve stems, and fresh wheel studs all around, but the outlet charged accordingly!

Re: Tires

Reply #149 – April 12, 2017, 06:23:16 pm

Sorry guy's,

80mph is what I should have said with 115psi. The tires are m170Z, 295/75 22.5.

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