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Forum
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RE: Need tire inflation by weight for Sunitomo 719 tire
And just to be clear:
The tables are MINIMUMS, not recommendations.
Plus, inflation pressure doesn't have as much effect on wear as alignment or even position on the vehicle. In passenger cars, the steer tires wear in the shoulders and the drive tires wear in the center, at about the same rate.
That means that in passenger cars, tires on a RWD wear differently, but at the same rate, so tire rotation gets more miles out of a set.
In FWD, the steer tires and the drive tires are the same, so generally the wear is even, but more rapid than the rears. Tire rotation is so the tires wear out at the same time.
I suspect the same is true of trucks and buses, although you don't find many FWD trucks or buses.
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CapriRacer
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02/03/23 06:38am |
Class A Motorhomes
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RE: Need tire inflation by weight for Sunitomo 719 tire
And allow me to confirm that the load vs inflation pressure thing is regardless of who manufactures the tire. It's a Tire Standardiztion Organiztion thing. In the US, that's The Tire and Rim Association.
You claim your previous tires had different values, and that could be because you had different Load Ranges.
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CapriRacer
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02/02/23 06:26am |
Class A Motorhomes
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RE: Tire Ply 14 or 16?
I have a 32 foot Class A that has a gross weight of 18,000 lbs I need to replace the tires due to age, it has 14 ply tires on it now...I am thinking about going to a 16 ply tire with the new tires.
Has anyone done this, & if so what were your reason for doing this, also did it change the ride to a harder ride?
For practical purposes, the change from a 14 PR to a 16 PR AT THE SAME INFLATION PRESSURE doesn't change things enough to sense anything different - like ride quality. What would be different is if you change the make/model.
What the increased PR does is allow you to increase the inflation pressure to be able to get a higher load carrying capacity.
You could inflate the lower PR tire to a higher pressure, too, but the structure of the tire isn't changing, so the tire gets hardly any increase in load carrying capacity.
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CapriRacer
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12/31/22 01:40pm |
Class A Motorhomes
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RE: Tire age?
Per a wiki says......
"Established in 1967, in Yuanlin City, Changhua County, Taiwan, by Luo Jye. Maxxis Tyres and CST tires are wholly owned subsidiaries of China mfg Cheng Shin Rubber Industry Company.
Maxxis International says their ST8008 trailer tires are mfg in Thailand.
Michelin doesn't mfg a 14"/15'/16' trailer tire but they do recommend their XPS Rib LT (comes in 16" load E sizes only) for commercial trailer service. They work great on rv and non rv trailers with 5k-6k axles.
Maxxis ST8008 trailer tires have had their share of issues also but nothing like many made in china load C/D/E poly carcass tires.
From their own website: "Founded in Taiwan, Maxxis got its start by making bicycle tires ...... "
https://www.maxxis.com/us/about-maxxis/
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CapriRacer
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12/12/22 12:22pm |
Travel Trailers
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RE: Tire age?
...... I've heard all good stuff about Maxxis tires too. My understanding is that Maxxis tires are made in China, but is an American Company. .....
Maxxis is a Taiwanese company.
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CapriRacer
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12/12/22 07:10am |
Travel Trailers
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RE: Blow outs and tires
......
the info is not easy to find but if one simply asks themselves..... why do tire manufacturers advertise more fuel efficient tread and/or tire compound in trailer trailer tires? what are there explanations? .
"Our most fuel-efficient trailer tires
Reduced rolling resistance and increased fuel economy.
Discover our tires designed for fuel savings, durability, and exceptional traction for driver confidence."
borrowed that directly from michelan's trailer tire web site.
most of the info you will find are from fleet companies. 3% reduction is a lot with an over the road truck. in a pick up, 3% isnt much of anything. wind is a bigger factor but every little bit still helps so why not?
There are 3 things that affect tire rolling resistance: The amount of deflection (meaning mostly inflation pressure), the amount of material (mostly tread rubber), and the material properties of the material (again, mostly the properties of the tread rubber)
You're quoting Michelin's truck tires. They don't make RV trailer tires, so be careful there.
So applying those three things, my best guess is that they don't have as much rubber in their trailer tires, and the tread compound is especially formulated for low rolling resistance.
Could that be applied to other tires? Of course, but there is a tradeoff.
There is a technological triangle for tread rubber compounds involving treadwear, traction (especially wet traction), and rolling resistance. Change one and you affect one of both of the others.
Yes, there can be differences in tread rubber compounds that improve RR without affecting that 3 way relationship, but those are small compared to the big triangle.
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CapriRacer
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12/12/22 07:07am |
Toy Haulers
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RE: Tires E-350/450: Stock 225/75? Tall 215/85? Wide 235/85?
One of the problems is one of clearance. Typically motor vehicles equipped with duallies don't have enough room to change tire sizes without difficulties, such dually spacing.
Be very careful here.
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CapriRacer
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10/23/22 06:21am |
Class C Motorhomes
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RE: Shopping new tires - is my shop confused or am I?
The ABCD... is an old system based on how many nylon plies the tire is made from...
I'd have to go back and look to verify, but I don't think that the OEM 245/75R16 tires off Dad's 1989 Chevy C2500 Scottsdale have an LT designation or an ABCDE load range rating. They just say "10 ply rating."
So ply rating was how it started. Then at some point in the 80's or 90's they must have adopted the LT-ABCDE system. Later on they started this load index/speed rating deal. Now pickup truck tires have ALL THREE which makes it confusing. IF you're not up on the legacy nomenclature you and the customer are talking two different languages.
Here's a copy of a page from the 1970 Tire and Rim Association Yearbook that has Load Range and Not Ply Rating: Barry's Tire Tech: 1970 TRA, page 2-04
The TRA yearbook from 1960 still uses PR, so somewhere in the 1960's is when they started using Load Ranges.
And according to Tire Guides, your 1989 C2500 will show an LT245/75R16 Load Range C or D and it had Load Range on the placard and the tire. Nowadays, you can only get Load Range E's in an LT245/75R16, but that's OK because the load carrying capacity of a Load Range E at the same pressure as a LR C or D is the same.
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CapriRacer
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10/18/22 05:07am |
Tow Vehicles
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RE: heavier trailer tires and fuel economy
Fuel economy? Complex subject!
Long Version: Barry's Tire Tech: Rolling Resistance and Fuel Economy
Short Version: Rolling resistance in tires can vary widely - up to 60% within the same size.
More pressure = less rolling resistance - all other things being equal, but we are talking about a few percentage points, where differences between tires can be double digit percent.
LT tires get worse fuel economy than equivalent P type tires because LT tires are made of a less compliant rubber (more internal friction = hysteresis)
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CapriRacer
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10/12/22 05:18am |
Fifth-Wheels
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RE: tire pressure
Once again, I am reminding people that those load/inflation pressure charts are MINIMUMS, NOT recommendations.
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CapriRacer
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08/21/22 07:42am |
Beginning RVing
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RE: Tire pressures
The only time you may need to adjust tire pressures within the same day is if you experience a SEVERE change in temperature - downwards (colder). And severe means more than 30°.
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CapriRacer
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07/10/22 06:10am |
Class A Motorhomes
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RE: 245’s on a 6 inch wheel?
Here's the math:
If you start with 8R19.5's, they are supposed to be 8.0" wide on a 6.00 rim, with an overall diameter of 33.8", a minimum dual spacing of 9.1", and a load carrying capacity of 3525# at 110 psi for a Load Range F.
A 225/70R19.5 is supposed to be 8.9" wide on a 6.75" rim, with an overall diameter of 31.9", a minimum dual spacing of 10.0", and a load carrying capacity of 3640# at 95 psi for a Load Range F.
Assuming for the moment that you have 6.00 wide rims to start with, the 225/70R19.5 will be about 8.5" wide on that 6.00" rim. Since it is common for chassis manufacturers to specify minimum dual spacing rims, the net effect is that there will be a loss of about 1/2" space between the duals. I urge caution in this area.
Also, the diameter change results in 6% change - which means the speedometer will read 60 mph when it is going 57 mph.
And lastly the load. In order to carry the same load the 8R19.5 does at 110 psi, the 225/70R19.5 only needs 92 psi.
So the real danger areas are the rim width (minimum 6.00" for a 225/70R19.5) and the dual spacing (9.6" for the 225/70R19.5 on a 6.00” rim)
So to answer the question asked: Yes, those will likely fit on the front. It is unlikely that a 1/4 inch more width will rub against any bodywork or suspension parts. The real problem is the dual specing.
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CapriRacer
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07/09/22 06:08am |
Class A Motorhomes
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RE: Can trailer tires be patched?
@bucky, how many plugged tires you had self destruct in a short time, or ever?
I'm working on a 50% failure rate. Luckily the tires didn't fail - just the plugs!
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CapriRacer
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07/01/22 05:39am |
Travel Trailers
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RE: Can trailer tires be patched?
Yeah, do not accept a "plug" as the higher pressure in ST tires tends to force the plug out.
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CapriRacer
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06/28/22 06:41am |
Travel Trailers
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RE: E vs. D rated trailer tires
I see no one has mentioned that a Load Range E has the same load carrying capacity as a Load Range D when inflated to the same pressure. At the LR D pressure, a LR E performs the same - ride, sway, etc.
So you can buy a LR E and use it in place of a LR D.Actually they have about 18% more capacity when inflated to the same pressure when comparing the 75R15(D) and 75R15(E).
Endurance Load Chart
........
Ah .... Mmmmm ..... Not exactly.
You compared an ST205/75R15 to a ST225/75R15. What is interesting is that the referenced chart doesn't show Load Ranges that Goodyear doesn't make, so you can't actually do an apples to apples comparison for those 2 sizes. (meaning you should be comparing an ST225/75R15 LR E to an ST225/75R15 LR D.) If you look at other charts, you'll see that principle in action.
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CapriRacer
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06/15/22 10:51am |
Tech Issues
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RE: E vs. D rated trailer tires
I see no one has mentioned that a Load Range E has the same load carrying capacity as a Load Range D when inflated to the same pressure. At the LR D pressure, a LR E performs the same - ride, sway, etc.
So you can buy a LR E and use it in place of a LR D.
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CapriRacer
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06/15/22 04:18am |
Tech Issues
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RE: Tire Recall
OK, a couple of things:
First, is that in the truck market, it's the buyer who specifies what tires are put on the vehicle - EXCEPT for vehicles not purposely built for customers. In those cases, it's the vehicle manufacturer who decides what tires go on.
In this case, the chassis was a bus chassis, which is usually used for intercity bus service. That is start and stop type of service, which the tires were designed for. The problem was that RV converters bought those chassis's and didn't change the tires out for something more suitable for RV service.
Ergo, I don't see how Goodyear was involved in the decision as to what tires were applied.
Second, how is the chassis manufacturer or the RV converter not liable? Maybe they are, but they settled earlier to avoid the bad PR.
Clearly Goodyear could have done a better job of handling this, but I just don't see this as a "defect". It's a "poor job of selecting tires" type of thing.
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CapriRacer
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06/09/22 06:07am |
General RVing Issues
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RE: GY Recall
Wow, Goodyear is recalling 19 to 26 year old tires? I'll bet this is part of a settlement of a lawsuit. I can not imagine why they would to this otherwise.
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CapriRacer
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06/07/22 06:11am |
Class A Motorhomes
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RE: Tire exploded in Florida
My first reaction was to ask how old the tires were, but I see in OP's profile that they have a 2020 Keystone trailer listed - so 2 to 3 years old.
Second, we haven't ruled out a road hazard. A photo might help us here.
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CapriRacer
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06/04/22 05:36am |
General RVing Issues
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