The 235/75r16 ATM's I have on my KK are XL rated. The maximum PSI and load rating is higher than on Standard rated tires. Either way they have been great all terrain tires and the ideal tire for a multi-use KK or KJ (flawless in the past record breaking winter). I stole this from Barry's Tire Tech:
"Extra Load tires have the same physical dimensions as Standard Load tires (commonly abbreviated "SL"), but have higher load carrying capacities due to the higher pressures, and are constructed with slightly stronger materials to accommodate the additional stress caused by both the additional load and pressure. I should point out that Extra Load tires (commonly abbreviated "XL") have the same load carrying capacity as SL tires at the same pressure. It is a common misconception that XL tires must therefore have better performance than an SL tire, but in fact they would perform worse because they are thicker and would hold in more of the heat generated. But this difference is so very slight that it really doesn't make much difference. (What I am trying to say is if you don't need XL tires, then don't pay the extra money for them.)"
