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Can someone explain the difference between ply ratings and load ratings. The local truck tire rep stated that the load rating is equal to the ply rating as follows:
E = 10 ply, F = 12, G = 14, and H = 16 and the sidewalls are reenforced to support the load. Is this correct. I need to replace and or upgrade my tires soon.
Thanks for the info
Mac
The original numeric value referred to the actual ply layers in the tire, now it's a designination indicating the tire is equal to the old rating, although it may be made with fewer ply layers. The load rating of a tire is dependant on it's size and the strength of it's construction that allows the use of higher inflation pressures, that is, if two tires are of the same size, but one is an 8 ply rating(D), and the other is a 12 ply rating(F), and both are inflated to 60 PSI, their load carrying capacity is identical. However, the F rated tire can safely be inflated to 120 PSI, hence it's load carying capacity at that pressure is greater than the D rated tire at it's maximum inflation pressure of 80 PSI. When weighing your rig and shopping for tires, allow at least a 20% plus factor for safety's sake. |
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