# What Do Hat Size Numbers Mean

### The tire size P22545R17 91V may not mean much to the average person but to tire geeks like us it speaks volumes.

What do hat size numbers mean. You simply cant know for sure if something is going to fit you unless you try it on. Next lets discuss the R. Use the following equation to determine your US Hat Size.

The numbers on trumpet mouthpieces primarily relate to the size of the hole inside them also known as the cup size. Its the height of the sidewall measured from wheel rim to top of the tread expressed as a percentage of tire width. First you will notice that your tire size will start with either a P LT or possibly ST.

This number such as 17 or 19 refers to the inside diameter of the tire in inches and determines the size of wheel the tire has to be mounted on. Read on to learn how to crack the tire code with this handy guide dedicated to tire types sizes. However some hats will have more specific sizes.

What do the numbers on tires mean. The next two digits belong together and represent the Load Index. What do trumpet mouthpiece numbers mean.

Circumference of your head in inches π. Most hats are sized generally as small medium or large. Here are some raw sizing basics that might help you get the right size and fit.

For example the number 60 in the above illustration represents that the height is equal to 60 of the width. The bigger the aspect ratio the thicker the sidewall of the tire. Test it out on a calculator.

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