Posted by JDEM on July 27, 2017 at 12:20:55 from (70.194.22.92):
In Reply to: Tire pressures posted by mss3020 on July 27, 2017 at 09:20:22:
Who the heck ever made a tire officially sold as having and 8 ply rating with 55 PSI max fill? I am not sure that is even legal. There are DOT and Highway Safety Administration rules that pretty much go like this for truck tires. C-range is 6 ply rated and max of 44-50 PSI. D-range is 8 ply rated and 65 PSI. E-range is 10 ply rated and 80 PSI. F-range is 12 ply rated and 95 PSI. I want to see info on someone selling a truck tire as a "8 ply" with only a 55 PSI max rating. If so, I am surprised they have not been sued out of business.
Tire pressure that is correct has little to do with the max rating on the tire. To work as designed, tires are supposed to squat to the "loaded radius" and that is solely determined by weight versus pressure. Not by "max pressure." That being said, many pickup trucks have stickers showing max rating on the back because driver's are not trusted to fill when needed during heavy loads, and then let air out during light loads.
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