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RE: Wheel failures?
I am in a similar position with an 05 Thor toy hauler rated at 10,000 GVWR. I have 3 of 4 Carlisle ST225 75/R15 that are showing signs of belt seperation...distorted tread. Have been purusing the threads here and it seems that Maxxis is the about the only ST tire anybody is having much luck with. I would also go to an LT tire if I didn't have to upgrade 4 rims to 16". I have been considering moving from load range D to E as well. I don't like running anything so close to the limit, things tend to wear quicker and fail when operated at the limit all the time. Have also wondered about the 80 PSI rim rating. I don't know what my rims are rated for. Chrome spoke wagon wheels??
5 PSI doesn't seem like much but If you assume a 30" tire diameter with a 12" inside rim diameter I come up with 593 Sqin x 2 due to two sides x 75 PSI = 88,950lbs of tension across the rim and tire, 5000 lbs more tension at 80 PSI = 94,880 lbs. The force would be carried equally across the rim and tire, so divided over a 36" (12*3.14)inner rim circumference, each inch of rim is under about 1235 Pounds tension, @ 80 PSI, 1317 Pounds of Tension/inch. I'm gussing the steel can handle that fairly comfortably but I've heard too many stories of people being killed overinflating aircraft tires with High Pressure nitrogen (5000PSI)that I get nervous inflating anything, even within limits! I try not to think about the 89,000 lbs of force waiting to let go into my chest.
Anyway, short story is that I'm also nervous about going to 80PSI on the standard steel wheels. I think I will go with the Maxxis E rated tires and set the pressure per the Maxxis inflation chart for my Trailers GVWR.
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All4fun
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08/29/09 02:48pm |
Fifth-Wheels
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