Replacement Trailer Tire Size ST175/80-13

Question:

I have a st 175 800 13 trailer tire? Is it the same as 175-80-13 How do I know how many ply the sidewall is?

asked by: Don

Expert Reply:

The ST175 tires you have are the same as the ST175/80-13 that you referenced # AM10210.

This tire has a 8 ply rating and a Load Range of D, but more importantly it has a max load of 1,610 lbs at 65 psi. Trailer tires should always be inflated to their max psi rating to ensure you get the full capacity and avoid heat build up.

expert reply by: Jameson C