Good Sam Club Open Roads Forum: Tech Issues: Tire Load Rating Questions
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 > Tire Load Rating Questions

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Teeshot1939

Massachusetts

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Posted: 06/20/20 09:26am Link  |  Quote  |  Print  |  Notify Moderator

2 years ago the truck tire shop installed 8 new Michelins (275/80R 22.5) on my tag axle diesel pusher that were a G rating. I now realize that the RV labels states it should have H rating tires. What is the difference in G and H. Weight allowed? Number of plys? Both or something else? Should I immediately switch out the tires to an H rated tire? What are the possible consequences if I don't? Thanks.

fj12ryder

Platte City, MO

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Posted: 06/20/20 10:04am Link  |  Quote  |  Print  |  Notify Moderator

Have you tried doing a Google search for your question? You're likely to get solid information rather than opinions and wrong information on a forum. For what you're searching, I would trust a tire site's specs before I would trust a forums' members' information.


Howard and Peggy

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Lwiddis

Lone Pine, CA

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Posted: 06/20/20 10:26am Link  |  Quote  |  Print  |  Notify Moderator

X2, fj. Start with the tire manufacturer. Do you know your axle weights loaded and set?


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Cummins12V98

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Posted: 06/20/20 10:32am Link  |  Quote  |  Print  |  Notify Moderator

The "G" in your size mentioned will carry a specific weight in single or dual application at MAX inflation. Same goes for the "H" tire but it will carry more.

I highly advise weighing your rig and making sure the tires meet your weights.

Look up "Tire weight/inflation chart" for your tire size and load range.


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MEXICOWANDERER

las peƱas, michoacan, mexico

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Posted: 06/20/20 11:17am Link  |  Quote  |  Print  |  Notify Moderator

I changed from 10x20" to 1100 x 22.5" on Quicksilver. Load range H

I had first thought having a major increase in tire size and rating for all 10 tires would make a joke out of weight capacity.

Until I took the loaded-for-bear rig to a public scales.

You need to first load your rig including water, fuel, and all the junk RVers take along on a long trip.

Only then will reality rear its ugly head. And make buying new tires less unpalatable. Also weigh the front axle separately. I weighed my tagger separately.

wolfe10

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Posted: 06/20/20 12:12pm Link  |  Quote  |  Print  |  Notify Moderator

Be aware that many tires with higher load ratings (like many going from G to H) have higher load carrying capacity AT HIGHER PSI's.

In some cases, those PSI's are above the rating for the OE wheels. So, verify mad wheel PSI before assuming you can carry the PSI to give you those higher load carrying capacities.


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valhalla360

No paticular place.

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Posted: 06/20/20 03:17pm Link  |  Quote  |  Print  |  Notify Moderator

Look on the side of the tire...it gives the load rating as weight.

H will generally be higher than G but it's an old style rating from back when they made stronger tires by adding more plys...Now it's done by modifying the steel belt configurations.

As others have said, take it to the scale (loaded for travel) and see where you fall. If you are under the rating for the current tires, no worries. Deal with it next time you need fresh tires.


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theoldwizard1

SE MI

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Posted: 06/20/20 06:30pm Link  |  Quote  |  Print  |  Notify Moderator

Ply ratings and letter rating really don't matter that much. The tire sidewall will always have a maximum load rating. THAT is what is important.

RJsfishin

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Posted: 06/20/20 08:27pm Link  |  Quote  |  Print  |  Notify Moderator

perdy simple if you ask me, don't overload the tire rating (duh)?


Rich

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