Tire Size Measurement Calculation On Westlake ST225/75R15 Radial Trailer Tire # LHWL304

Question:

I thought the first number was the width of the tire not the height

asked by: Jake S

Expert Reply:

You are correct, the first number of the Westlake ST225/75R15 Radial Trailer Tire # LHWL304 is the width. The 225 is the mm measurement or 8.85" wide. The 2nd number 75 is the percentage of the width the tire side wall is tall. So 75% of 225 is 168.75mm or a 6.64" tall side wall. And being on a 15" wheel the final number gives you a total height of 28.28".

expert reply by: Bud M