Uh oh question on tires

Topic: Uh oh question on tires (Read 2283 times) previous topic - next topic

Re: Uh oh question on tires

Reply #50 – January 19, 2018, 08:45:41 pm

No "air" in tires that is not dry air.

In our case using the "g" rating tire pressure that the coach came with would be 3 pounds too high on the front and 13 on the rear.

With the "h" rated current tires we would be 23 too high on the fronts and 33 high on the rear.

My tire pressure/temp sending units on our car show a 10% rise in temps warm versus cold.

On a smooth road the ride differences may not be as noticeable but on our so cal freeways the ride would be jarring IMO

Re: Uh oh question on tires

Reply #51 – January 19, 2018, 08:55:03 pm

Quote from: Walkerfam7 – January 19, 2018, 06:55:20 pm

This is what the guy was telling us at the tire shop. Unfortunately, they are so in demand that they have been backordered. He was supposed to get an order of them today, but he didn't. I think we are going to go with Continental again. I hate to admit it, but we discovered after the tire guy got underneath the RV that the Conti's that we had on the back were '08 and '09 DOTs. If I had known they were that old we never would have driven on them at all, much less went two years on them. Thankfully he did not notice any other serious cracks on the other tires. I'm very grateful we have not had any accidents. But...if they lasted that long, then Continental deserves my business again. The guy said our Michelins on the front, even though they are five years old actually look great because we actually travel a lot and they don't sit much at all. He said we don't need to replace those yet. We will keep a careful eye on them each time we check the tire pressures before driving, as usual.

We are installing Uniroyal RS20's on Tuesday $2500 all 6. Balanced,stems,labor....

Re: Uh oh question on tires

Reply #52 – January 19, 2018, 09:04:49 pm

Quote from: Walkerfam7 – January 19, 2018, 06:55:20 pm

................... But...if they lasted that long, then Continental deserves my business again. .............

FMCA has some great Continental pricing. Continental Tire Program

Michelin FMCA pricing: Michelin Advantage

Comparison chart: https://blobs.continental-tires.com/www8/servlet/blob/571048/a560a1d78f9d95c59bad6bb8df51c3ec/comparison-chart-data.pdf

The Conti HSR2 Eco Plus and the Michelin X Multi Energy Z are the ones I am keeping in mind for next tire purchase.

Edit: to add the Uniroyal thread recent discussion: Uniroyal Tires

And Uniroyal RS20 page: Uniroyal Truck Tire Selector | Uniroyal Truck Tires

Re: Uh oh question on tires

Reply #53 – January 20, 2018, 10:54:56 am

I think you're doing yourself a huge disservice considering only Michelin or Continental. Any brand will work great. This is a massive RV, not a sports car. I keep my tires inflated near the max sidewall psi, I dont care what my weight is, it rides fine and the extra peace of mind knowing it has plenty of pressure is worth it. Problems come from under inflation, not over inflation.

Consider Uniroyals, or Toyo or any other brand (besides chinapops). Visit your tire shop and ask for the four freshest tires in your size that they have on the shelf! You cannot go wrong. No 22.5" tire with a reputable name on the side will give you trouble. Truckers would crucify the company and they would be out of business quickly if they didnt produce a good, reliable product.

Re: Uh oh question on tires

Reply #54 – January 20, 2018, 11:37:24 am

I am strickly a data guy. I looked hard to find any Chinapops. Maybe you have more data points then i do. I could not find anyone who had a Chinese tire come apart . I took Really nice Samsons off, and put new Samsons on. Ride well and round. No issues for 2K so far.
No so with the over priced Michelin. Granted more tires on the road in the USA.

Please post any negative real data findings. Not just "they must be crap cuz they're from China."

Re: Uh oh question on tires

Reply #55 – January 20, 2018, 02:05:23 pm

Quote from: RvTrvlr – January 20, 2018, 10:54:56 am

I think you're doing yourself a huge disservice considering only Michelin or Continental. ......Consider Uniroyals, or Toyo or any other brand (besides chinapops).......

I want to stay with 275/80/22.5 H rated (not change to 295/75/22.5). That imposes 'some' limits on brands. My existing Michelin date codes are May 2012. (6 years in May). No sidewall cracks, no abnormal wear, never run under inflated nor overinflated.

However, even though these tires look great at near 6 years, I am considering replacing the tires in the next few months so I can avoid sales tax (we are in Oregon right now). We will likely be heading south bound in a few months, and not be back in the PNW for a year to three years. We will likely be doing NV, AZ, TX, FL to NAS Key West (and states in between) over the next year.

I sent out inquiries to a two commercial tire shops in Roseburg OR and Eugene OR for Uniroyal RS20, Conti HSR2 Eco Plus and the Michelin X Multi Energy Z. I also asked about take off value (if any). In Sept 2016 on our previous coach, Superior tire in Eugene would not offer any take off value on 7 year old Michelin XZE 275/80/22.5 with no sidewall cracks. I'm currently leaning towards the Contis - good pricing with FMCA discount.

We are currently doing the off seasons for our travels, for medical/dental now in OR, and far less crowded campgrounds as well during the off seasons

Note: Four states with no sales tax: Delaware, Montana, Oregon, and New Hampshire. A fifth, Alaska, has no state-level sales tax but allows municipalities to impose the retail-level tax.

Re: Uh oh question on tires

Reply #56 – January 20, 2018, 02:40:34 pm

Just curious, why not the 295's?

Re: Uh oh question on tires

Reply #57 – January 20, 2018, 02:49:32 pm

Quote from: jcus – January 20, 2018, 02:40:34 pm

Just curious, why not the 295's?

Want to avoid the slim chance of any extra width issues. For example, maximum steer tire wheel cuts when backing into/pulling out of tight campgrounds, tire kiss on rear duals, tag lift clearance, etc. Previous owner on my previous coach (Bluebird) went from 275/80 to 295/75 before I bought it. I went back to OEM size at the next tire change.

I have read a "few" issues over the years with extra width.

OEM size carries the loads I need with no issues. Other peoples opinions will vary of course.

Re: Uh oh question on tires

Reply #58 – January 20, 2018, 02:52:24 pm

They also cost a little bit of MPG and speed.

Re: Uh oh question on tires

Reply #59 – January 20, 2018, 03:13:13 pm

Quote from: Protech Racing – January 20, 2018, 02:52:24 pm

They also cost a little bit of MPG and speed.

295/75r/22.5 39.9 inches diameter 505 revolutions per mile
275/80r/22.5 39.8 inches diameter 507 revolutions per mile

Don't think most people could tell the difference. Have used the 295's on all my coaches with no adverse effects. Do like the little extra load carrying capacity, so I run a little lower pressure for a better ride.

Re: Uh oh question on tires

Reply #60 – January 20, 2018, 03:18:49 pm

Think it would be very hard to measure any MPG difference between the sizes. We have over 40,000 on 295/75s and other than a occasional slight "polishing" of one of the airbag plates when the coach is leaned way over, there is no problem. We take the coach over a lot of gravel/dirt roads in the back country and down river washes in Baja to the beach so if there was going to be a clearance problem, we would see it. Hey, 1/8" in diameter means the tire would be 1/16" closer to the air bag plate. A worn tire vs a new one is a lot more than that.

Pierce

Re: Uh oh question on tires

Reply #61 – January 20, 2018, 03:52:19 pm

Quote from: jcus – January 20, 2018, 03:13:13 pm

295/75r/22.5 39.9 inches diameter 505 revolutions per mile
275/80r/22.5 39.8 inches diameter 507 revolutions per mile

Don't think most people could tell the difference. Have used the 295's on all my coaches with no adverse effects. Do like the little extra load carrying capacity, so I run a little lower pressure for a better ride.

How about the width difference 275/80 to 295/75? Tire Size Comparison

On another note, something strange about the OEM size in Uniroyal RS 20 is the size difference and revolution (RPM) difference. Also lower load rating (all in OEM size comparing Michelin/Conti/Uniroyal)

Uniroyal RS20 275/80r/22.5
Load Range H
Catalog Number
42794
Loaded Radius
18.3 in
Overall Diameter
39.4 in
Overall Width
10.8 in
Approved Rims
8.25, 7.50
Min. Dual Spacing
12.2 in
RPM
551
Tread Depth
18/32
Max Speed
75 mph
Max Load Per Tire Single
6610/120 lbs/psi
Max Load Per Tire Dual
6005/120 lbs/psi

Conti 275/80r/22.5 :
Load Range
H
Article Number
5120850000
Tread Depth
23
Max Speed
75
Static Loaded Radius (IN)
18,7
Overall Inflated Diameter (IN)
40
Overall Inflated Width (IN)
11,1
Loaded Section Width (IN)
12,6
Approved Rims
8.25,7.50
Minimum Dual Spacing (IN)
12,5
Revs Per Mile (IN)
518
Tire Weight (LB)
117
Max Loaded Inflation-Single (LB)
7160/120
Max Loaded Inflation-Dual (LB)
6610/120

Michelin similar to Conti. Uniroyal seems to be quite different.

Re: Uh oh question on tires

Reply #62 – January 20, 2018, 03:59:54 pm

Hans & Marjet,
We bought our Uniroyal RS20's last February, out the door for $2,200 @ Visalia Tire & Wheel. The price was much better than was quoted in Texas. Suprised the hell out of me.

Bob

Re: Uh oh question on tires

Reply #63 – January 20, 2018, 04:04:29 pm

I use the 295 also.
But the lighter/ smaller/narrow tire at higher pressure will roll a lot easier. The tires have a drag /rolling resistance value measured at various operating pressures.
My guess is maybe .2-.4 MPG @ 11MPG. Of the 275 G tires at 110psi vs the 295H tires @ 95psi.

Edit. He did this for Cooper, now he does hub/ bearing/tire for Nissan.

Re: Uh oh question on tires

Reply #64 – January 20, 2018, 05:05:31 pm

Dan, This is a pic of my coach with a 295. The extra 3/4 inch width does not seem to make any difference in clearances in wheel well when I turn lock to lock. I think increased diameter could be a problem though.

Re: Uh oh question on tires

Reply #65 – January 20, 2018, 05:21:59 pm

Quote from: Bob Rozek – January 20, 2018, 03:59:54 pm

Hans & Marjet,
We bought our Uniroyal RS20's last February, out the door for $2,200 @ Visalia Tire & Wheel. The price was much better than was quoted in Texas. Suprised the hell out of me.

Bob

Thx Bob...are you satisfied with the performance of the RS20's.....How much in TX ??

Hans

Re: Uh oh question on tires

Reply #66 – January 20, 2018, 05:34:07 pm

Again we are back to WHICH 295 is OK and which interferes?

295/75R22.5 IS, repeat IS "smaller/less diameter" than a 295/80R22.5!

Would like to hear from anyone with a 295/75 who has interference issues.

Re: Uh oh question on tires

Reply #67 – January 20, 2018, 05:47:03 pm

Quote from: AC7880 – January 20, 2018, 03:52:19 pm

Also lower load rating (all in OEM size comparing Michelin/Conti/Uniroyal)

Uniroyal RS20 275/80r/22.5
Load Range H

Max Load Per Tire Single
6610/120 lbs/psi
Max Load Per Tire Dual
6005/120 lbs/psi

Conti 275/80r/22.5 :
Load Range
H

Max Loaded Inflation-Single (LB)
7160/120
Max Loaded Inflation-Dual (LB)
6610/120

Michelin similar to Conti. Uniroyal seems to be quite different.

Good catch on the load/inflation difference! Uniroyal 275/80R22.5 seems to be halfway between LR G and LR H of a Michelin in terms of load/inflation. So not all manufacturers of the same size/load range tire have the same tables and it's important to look up what applies to the specific mfr/model/LR/size and not go by the wall plate or owner's manual of a coach (since that would only apply to the original tires).

Re: Uh oh question on tires

Reply #68 – January 20, 2018, 05:56:43 pm

Quote from: wolfe10 – January 20, 2018, 05:34:07 pm

Again we are back to WHICH 295 is OK and which interferes?

295/75R22.5 IS, repeat IS "smaller/less diameter" than a 295/80R22.5!

Would like to hear from anyone with a 295/75 who has interference issues.

Brett, I was talking about the 295/75r/22.5. which I have not had interference issues with. Not sure, but it appears that there is far more choices for the 75r tire than the 80r tire, and prices appear lower also.

Re: Uh oh question on tires

Reply #69 – January 20, 2018, 05:58:45 pm

Hans,
There was a significant difference in the ride quality and noise compared to the Goodyear 670RV tires that were removed. We did add Centramatics and so far we are pleased with the results. I think the same tires in Texas were $2600 out the door.

Bob

Re: Uh oh question on tires

Reply #70 – January 20, 2018, 06:02:05 pm

Quote from: jcus – January 20, 2018, 05:56:43 pm

Brett, I was talking about the 295/75r/22.5. which I have not had interference issues with. Not sure, but it appears that there is far more choices for the 75r tire than the 80r tire, and prices appear lower also.

Thanks, Jim.

Kind of difficult to tell which size 295 tires (80 or 75 series) are exhibiting interference issues from this thread. Just want the "bottom line" of this thread to reflect reality.

Re: Uh oh question on tires

Reply #71 – January 20, 2018, 07:01:30 pm

Quote from: Bob Rozek – January 20, 2018, 05:58:45 pm

Hans,
There was a significant difference in the ride quality and noise compared to the Goodyear 670RV tires that were removed. We did add Centramatics and so far we are pleased with the results. I think the same tires in Texas were $2600 out the door.
Bob

Worse or better?

Re: Uh oh question on tires

Reply #72 – January 20, 2018, 07:23:41 pm

Much Better!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

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