Tires: load range comparison, light truck applications, load ranges

Question
Barry How do I compare a load range E tire to the new designation 113.
Thanks

Answer
Charlie,

Ah ....... Mmmmmmmmm ..........Oh ..........

This is complex so let me show you how this works.

Load Index (the numbers) is a way of expressing the load carrying capacity:  LI113 = 2535#

Load Range is a way of expressing the the load carrying capacity, but it varies by tire size.  For example:  

LT225/75R16 Load Range E:  Max Load 2680# @ 80 psi.  Note:  LI115

LT245/75R16 Load Range E:  Max Load 3042# @ 80 psi.  Note:  LI120

You didn't say so, but I suspect you are changing from a P type tire (where they don't use load ranges# to an LT type tire #where they do).  I am not a fan of this type of thing because to get the same load carrying capacity in an LT type tire, the pressure has to be 15 psi higher.

And one other little quirk you need to be aware of:  P type tires used in Light Truck applications have to be derated by 10% to get the usable load carrying capacity.  That has to be factored into the equation.

If this seems overly complex and you don't what to work through all the math, post a followup with the details of what you are trying to do, and I try to give you the best answer I can.