What Is the Difference Between ST215/75D14 And ST705/75D14 Tires

Question:

My trailer has ST215/75 D14 tires now what is the difference i i switch to 205 which one is best for highway travel at speeds 65-70

asked by: Polly

Expert Reply:

If you change from a tire like part # AM1ST90 which is a ST215/75D14 tire to a tire like part # AM1ST86 which is an ST205/75D14, the tire will be about 1/2 inch narrower and 1/2 inch smaller diameter.

Both tires will perform well if they are properly inflated and if the trailer is properly and evenly loaded. Most trailer tires have a 65 mph speed rating. Exceeding this speed can cause heat to build up in the tire reducing the lifespan of the tire.

expert reply by: Jeffrey L