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Old 03-07-2016, 10:05 PM   #1
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Should I move from load range G to H?

We are putting new tires on our coach this year and would like a little more separation between the axle weight and the tires load capacity at full inflation.

We run a 275/80R22.5 load range G tire at near its weight limit.

(Axle limit is about the same. NOT trying to exceed axle weight rating.)

Other than a few $s more and presumably a slightly stiffer ride. Any "cons" to going up to load range H? Tires choices appear to be about the same width, diameter, etc.

With a higher weigh rating we could run the tires at a lower than max PSI (and still be appropriate for the weight on the tires) and that sounds safer to me.

Thoughts?
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Old 03-07-2016, 10:11 PM   #2
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Probably worth the upgrade to run them at less than almost full capacity. Just be sure your wheels will handle the higher pressure. Even our Alcoa wheels will only take 120 psi and most steel wheels are lower.
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Old 03-07-2016, 10:22 PM   #3
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On the duals, you can't drop the pressure below than the lowest PSI in the load inflation table, even if you are carrying less weight than the tire is rated for at that pressure. This is to prevent contact between the tires as the sidewalls flex. The H tires will weigh more. After a long phone conversation with Michelin tech support, I moved up two load ranges (G to J) to get a tire with a higher margin of safety on the front axle and don't find the ride too harsh.


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Old 03-07-2016, 10:50 PM   #4
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Quote:
Originally Posted by Mr_D View Post
Probably worth the upgrade to run them at less than almost full capacity. Just be sure your wheels will handle the higher pressure. Even our Alcoa wheels will only take 120 psi and most steel wheels are lower.
Current tires are rated max 110. We run 110 in the front, 100 in the back.

The load range H tires go to 120 psi.

Our rear rims are stamped "max 120." I assume the fronts are the same, but won't need even 110 with load range H.

With H's, table says we could run 100 in the front and 85 in the rears. I think l would run 110 in the front and 95-100 in the rear. Still thinking on that.
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Old 03-08-2016, 06:49 AM   #5
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Should I move from load range G to H?

I have to run Load Range H on my front axle due to the weight. I just replaced my rear tires and put the same Load Range H tire on when I could have used Load Range G. I like having the extra load capacity and understressing the tires.

They have worked fine for our last couple trips.

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Old 03-08-2016, 08:21 AM   #6
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For the same weight carrying capacity, the G & the H will use the same inflation psi, ride at the same height, and the same comfort. With the H, you could choose to increase the psi and thus the weight capacity, but the difference in ride height will be essentially zero. Maybe 0.2" difference?

Look at the tire inflation tables for whatever brand you are considering and you will see what I'm talking about. The H just extends to a higher load range, but is identical at the same loads as a G.

So yes, the H is a good choice if you want a bit more safety factor, but it won't have much effect otherwise.
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Old 03-08-2016, 09:39 AM   #7
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Yes
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Old 03-08-2016, 06:47 PM   #8
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Quote:
Originally Posted by Gary RVRoamer View Post
For the same weight carrying capacity, the G & the H will use the same inflation psi, ride at the same height, and the same comfort. With the H, you could choose to increase the psi and thus the weight capacity, but the difference in ride height will be essentially zero. Maybe 0.2" difference?

Look at the tire inflation tables for whatever brand you are considering and you will see what I'm talking about. The H just extends to a higher load range, but is identical at the same loads as a G.

So yes, the H is a good choice if you want a bit more safety factor, but it won't have much effect otherwise.
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Old 03-08-2016, 07:34 PM   #9
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Quote:
Originally Posted by Gary RVRoamer View Post
For the same weight carrying capacity, the G & the H will use the same inflation psi, ride at the same height, and the same comfort. With the H, you could choose to increase the psi and thus the weight capacity, but the difference in ride height will be essentially zero. Maybe 0.2" difference?

Look at the tire inflation tables for whatever brand you are considering and you will see what I'm talking about. The H just extends to a higher load range, but is identical at the same loads as a G.

So yes, the H is a good choice if you want a bit more safety factor, but it won't have much effect otherwise.
Not in the tables I am using. Attached is the load range H table and the load range G starting at 70psi going to 110 psi.
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Old 03-08-2016, 07:48 PM   #10
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Quote:
Originally Posted by mjeffrey View Post
We are putting new tires on our coach this year and would like a little more separation between the axle weight and the tires load capacity at full inflation.

We run a 275/80R22.5 load range G tire at near its weight limit.

(Axle limit is about the same. NOT trying to exceed axle weight rating.)

Other than a few $s more and presumably a slightly stiffer ride. Any "cons" to going up to load range H? Tires choices appear to be about the same width, diameter, etc.

With a higher weigh rating we could run the tires at a lower than max PSI (and still be appropriate for the weight on the tires) and that sounds safer to me.

Thoughts?

The real gain for you, would be if you have room in your wheel well for 295/80s on the steer axle. You could leave the drive axle with the 275s. You could support the same weight with 90-95 psi.
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Old 03-08-2016, 10:13 PM   #11
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Will have to investigate those. Not much wider overall. 123 psi?!?

That is a good point that I could use different tires in the rear.
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Old 03-09-2016, 10:57 AM   #12
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What Steve said...

And unless you have a real weight problem, close to the limits of capacity for your given load rate tire, no real reason to pump up to the H. For the same size, call it a wash on a stiffer tire vs running a lower PSI setting. (Maybe not a a completed wash, but I'd doubt any noticeable difference in comfort and or handling.)

The steers carry their full corner by themselves, and also control the direction of travel. So going up a tire size as Steve suggested, gives you more meat on the ground where those tires make contact, a little drop in PSI while running could add to more comfort where you usually feel it the most, from the steers.

We have 12R 22.5 on 8.25" rims. I came very close to up sizing my tire to 315/80 22.5. Not all tire manufactures will allow this, and those that do have you derate the tire loads due to the thinner wheel. This would have also been a bump up in load rating. I elected to stay with the 12R's for a few reasons:

1) Having all tires the same, allows me to swap them around if needed for wear (Especially with us having a tag, we can go from steers to tag pretty easily.)
2) My front end weight was well within the range of the axle.
3) I could not talk the DW into agreeing to pumping up to 9" rims for the steers!

I do feel safe with the tires on our coach. While others have had coaches that were pushing the limits, or actually over the limits, when delivered. Many Wanderlode owners have changed the steers over to 9" rims to upsize the tires and capacity because of this, on select years and models. Country Coach had a few too, mine is not one of those years off models.

Best of luck to you on your decision, be safe, have fun,
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Old 03-09-2016, 02:11 PM   #13
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I switched from the OEM 255/80R22.5 LRG tires to 275/70R22.5 LRH tires. The original tires were at their upper load limit, had to be inflated to 105 psi, and were in fact the limiting factor in the coach GVWR ratings. The new tires can support the same load at 95 psi, which makes for a much better ride with much more safety margin. The tire circumferences are almost the same, although I did tweak the ECU settings to match the new tires exactly.
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Old 03-09-2016, 06:11 PM   #14
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Reading load tables and making pressure/weight decisions from them can be very dangerous. Many folks seem to want to get to lower pressures in hopes of a softer ride by going up ratings ( G to H) . There is more than the tables involved in such pursuits. It may appear, for instance, that a G at 90 pounds will carry the same as an H at 80 pounds but that does not consider the wheel it is mounted on and at 80 pounds the H could be a lot closer to unmounting itself...not a good thing. Going up a rating is usually fine but the pressure should remain the same (or very close) and the stronger rating should give some piece of mind but the tire will be harder riding and is probably going to disappoint if a "softer" ride is the goal.
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