Quote:
Originally Posted by gascott
My Recreational Vehicle Specification Nameplate states the "Minimum Tire Size & Ply Rating" 235/85R16E. This is my first RV. I purchased it used in 2017. I need to replace tires. I noticed Keystone is using ST235/80R16G tires on their 5th wheel trailers now. I'm thinking the G rated tires would be a better fit for my 14,020 GVWR 5th wheel if my aluminum wheels can support them without cracking. Since my 5th wheel has plenty of ground clearance, would there be any problems using the 1" smaller diameter ST235/80R16G tires?
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With the current wheels ??? NO !!!!!
Your wheels are rated at 3042 pounds at 80PSI. You may still be "loading below 3042 pounds on those old wheels, but airing them up above 80PSI is creating a 'ticking bomb"..... Get new wheels along with your new tires if you're going to upgrade to 14 ply tires. If you "elect to only air the 14 ply tires to 80PSI" then effectively, the upgrade is "nil" since the tires won't support any more weight than the equivalent size 10 ply tire. It's the "air pressure" that determines the load rating" not the number of plies at a lower pressure....