Tire fitment question

[Don Bradner]

Is that your Wide Body with that 7000 lb rating?

Clearly, Alcoa has made a lot of different rims at 8.25 inches over the years. I
wish I had a WB sitting in front of me so I could look, but I do know that mine
were not below the '90's 14,600 front axle rating, which a 7,000 lb would have
been. In the current Alcoa book they list several different 8.25 22.5-inch
wheels, with ratings as high as 8050 lbs, but none lower than 7300.

At 110PSI, the 12R is rated for 6870 lbs in a single tire configuration, which
would be underinflated for any of the 90s wide bodies. They all needed a full
120PSI to carry the full weight. I'm surprised an 88WB wouldn't weigh that much.

The ride difference between a 12R at 120 and a 315 at 100 IS noticeable.

The rubbing when suspension-dumped with steering turned had nothing to do with
pressure. It is a phenomenon on most, if not all, of the wide-bodies at any
pressure.

On 3/15/2013 at 5:23 AM tulipvendor50 wrote:

>Don stated:
>"Alcoa documents list 8.25-inch rims variously as 7400 lbs"
>
>Bill:
>There is a coach right next to me with 8.25 inch rims and it clearly
>states "7000lbs"
>
>Don stated:
>"As far as the fenders I had the older rubber ones, and the tires would
>hit when dumped-while-turned even with 12R - the extra half-inch of tread
>on the 315 made no difference. I did NOT put 315s on the drivers because
>of the potential rubbing issues. Those that have done so (Shane comes to
>mind) run their drivers at higher pressure than needed for the load, which
>negates the ride improvement. "
>
>Bill:
>I run my tires at 110lbs pressure and have had no problem with the
>rubbing. I doubt very much if one could really feel the difference in
>ride with the higher or lower pressure.
>
>
>
>
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