Understanding Road Bike Tire Sizes

It s a holdover from an old french system that designated tire sizes using the letters a b and c. These would usually be measured in inches 26 27 etc or millimeters 650 700 etc. A hybrid of road and mountain tires cyclocross tires are labeled as 700c and have widths indicated in millimeters like road bikes yet are knobbie like mountain bike tires.

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Note that the c does not stand for centimeters.

Understanding road bike tire sizes. 23c 25c and 28c their width in mm. Typical road bike tire. The table below lists most of the sizes of tyre that are likely to be found in the uk. As the width increases the tire will have more contact surface with the road making it more stable and comfortable.

Finding the right inner tube depends on the size of the tires on your bike. Where you see a block of two or more compatible sizes having the same bead diameter you can assume that intermediate sizes exist that will also fit the same rim. Read the size carefully. 700 x 32c indicates a tire that has an outer diameter of 700mm and a width of 32mm.

As the width decreases there is less rolling resistance or friction and therefore is faster. Generally bike tire sizes are indicated with two numbers that correspond roughly to the outside diameter of the tire and the width of the tire. The second smaller number is the tire s width. Road bike tires generally come in three widths.

Between 18 622 and 25 622 there are tyres of 19 20 22 and 23mm section. Sizes written as decimals such as 2 75 are different than sizes expressed as fractions such as 2 3 4. While you can find a variety of bikes with wheel sizes ranging from 16 to 27 5 inches the most common sizes include 26 inches 27 5 inches 29 inches and 700c.