Tire(Tyre) Options

[john r. lebetski]

First step is to check the load rating on your 17” tire selections to see if they measure up or are eliminated by lower rating. Next issue would be
if the rears will rub bags with a 245 section width. Not sure as aspect ratio also interacts. Also are wheels hub centric? If not that rules them out
for me, though some will say they are safe as lug centered. No thanks.
--
John Lebetski
Woodstock, IL
77 Eleganza II

 

[Richard RV]

Jeff,

Maximum tire load is at AFAIK specified at maximum tire pressure. Tire pressure should be set based on the actual load on that tire. The correct
tire pressure determines the size of the road contact patch and whether the tire will wear evenly.

It's important to weigh all 6 wheels then reference the manufacturer's tire load/pressure chart to determine the correct psi. Weighing your coach
also will point out lateral load imbalance. If the lateral load imbalance exceeds 250 pounds in the front or 600 pounds in the rear it will affect
handling.

Most all imbalance affects handling, but the GMC's rear air suspension masks the higher/lower corner that would be readily apparent on a
non-ride-height-controlled vehicle suspension. That is, you can't see a load imbalance in a GMC. At some of the weigh-ins at rallies we've seen some
waaay out of balance coaches.

You may find that 17" tire might require >75 psi to carry the load. That would be a pretty harsh ride I'd reckon.

Richard
--
'77 Birchaven TZE...777;
'76 Palm Beach under construction;
‘76 Edgemonte waiting its turn

 

[jim kanomata1]

https://www.gmcrvparts.com/product-p/ap417.htm
The recommended tire is there,

> Jeff,
>
> Maximum tire load is at AFAIK specified at maximum tire pressure. Tire
> pressure should be set based on the actual load on that tire. The correct
> tire pressure determines the size of the road contact patch and whether
> the tire will wear evenly.
>
> It's important to weigh all 6 wheels then reference the manufacturer's
> tire load/pressure chart to determine the correct psi. Weighing your coach
> also will point out lateral load imbalance. If the lateral load imbalance
> exceeds 250 pounds in the front or 600 pounds in the rear it will affect
> handling.
>
> Most all imbalance affects handling, but the GMC's rear air suspension
> masks the higher/lower corner that would be readily apparent on a
> non-ride-height-controlled vehicle suspension. That is, you can't see a
> load imbalance in a GMC. At some of the weigh-ins at rallies we've seen
> some
> waaay out of balance coaches.
>
> You may find that 17" tire might require >75 psi to carry the load. That
> would be a pretty harsh ride I'd reckon.
>
> Richard
> --
> '77 Birchaven TZE...777;
> '76 Palm Beach under construction;
> ‘76 Edgemonte waiting its turn
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> GMCnet mailing list
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--
Jim Kanomata ASE
Applied/GMC, Newark,CA
jimk
http://www.gmcrvparts.com
1-800-752-7502