Bicycle Tire Sizes Conversion Charts

The late bicycle mechanic sheldon brown noted that there were four different types of 26 inch wheels developed in different countries and by different manufacturers that used fractional measurements for width such as 1 1 4.

Bicycle tire sizes conversion charts.

Tire size chart for bicycle rim. The standard is called the iso 5775 and if your shop doesn t have the chart available it is published at the websites of the iso and the etrto. Size variations of tubulars are covered in sutherland s handbook for bicycle mechanics 7th edition available from sutherland s and on the mechanic s bookshelf at better bike shops. Tire size chart for bicycle rim.

Take the rim with you when buying a tire and vice versa. Conversion tables for common bicycle tire sizes. If you are unsure of your bicycle tire size you can look into a bicycle tire table where you can easily and simply find just the tires that fit your bike. When it is time to replace your well worn tires it is a good opportunity to unlock the full potential of your wheels by trying something new.

Mountain bike sizing can be affected by suspension and your tire choices. So make sure you look at a tire size chart and try a full suspension mountain bike for size before buying. Bicycle tires come in a variety of sizes and with time the international organization for standardization iso has developed a universal system to better understand and regulate tire and rim sizing. Measure your bicycle wheel and tire size with table.

To convert tire tube sizes from one notation to another it is necessary to use the chart published by the iso available at any reputable bike shop. The tire size chart below includes bicycle tire sizes and how they are commonly written. For standard hardtails our mountain bike size chart should be a god send. 26 iso size 559 is the most commonly used size for modern mountain bikes and is also used by many hybrid bikes.

Sizes of 26 and 24 tubulars are not well standardized. There are five tire diameter sizes that are in common use on modern standard adult bicycles. Given rim diameter the iso diameter and tire diameter the size of your tire converted to millimeters wheel diameter rim diameter tire diameter 2. Nowadays bike tires are typically marked according to iso standard a system originally developed by etrto european tire and rim technical organization but older english and french tire size dimensions are still used as well use the data from the following tables to determine interchangeability and convert between iso etrto english.

This chart will provide guidance on what tires sizes can match your internal rim width. Mountain bike size chart. 27 iso size 630 is an older size that was used for road bikes but since so many bikes were built with this size it is still readily available.