Originally Posted by acadianbob
Also, do you have P-metric tires? You might consider LT tires; load range C would likely be enough. Our newer F150 is nearly identical in configuration to the previous model. One difference, the newer truck has LT tires. We have discovered that there is a LOT less rear bounce with LT tires due to the stiffer sidewall.
Disagree. Tires of the same size, P-series compared to LT load range C tires, the P-series tire will be stronger.
Example: 275/65R18 is standard on a lot of our F-150s.
P275/65R18 has weight code of 116 = 2,756 pounds @ 44 PSI.
LT275/65R18C has weight code of 113 = 2,535 pounds @50 PSI.
To improve on the weight capacity of the stock P-series tires, you have to move up to the LT with load range E, weight code 123 = 3,415 pounds @ 80 PSI.
So if you have a late-model F-150 4x4 with P275/65R18 tires, you can move up to LT275/65R18E.
But my 4x2 has P265/60R18 tires, with revs/mile of 681. Nobody I can find makes LT tires that size. I could go to LT275/65R18E, but they have revs/mile of 651. So my speedo/odo/trip meters would be slow by 4.6% unless I paid my Ford dealer to recalibrate the speedo for the taller tires. And unless the dealer is a dear friend, he will charge you a minimum of one hour labor to do that little deed.
Granted, 18" LT load range C tires will weigh about 8 pounds more than P-series tires of the same size, so maybe that translates into a stiffer sidewall. But it does not translate into a stronger tire with more weight capacity.