The tire size chart below includes bicycle tire sizes and how they are commonly written.
Inch bike tire sizes chart.
Mountain bike size chart.
The letter at the end of a tire size is a throwback to an old french system when the letters a b and c designated different inner tire diameters it does not stand for cm.
Used on mountain bikes these tires also go by the names.
23c 25c and 28c their width in mm.
When it comes to choosing width there are two major factors at play.
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.
Mountain bike sizing can be affected by suspension and your tire choices.
For example with a range from 1 9 to 2 1 2 0 is an optimal option for most riders.
Road bike tires generally come in three widths.
26 1 3 8 1 1 2.
The chart is only applicable to light bicycle rims with a unique rim tire interface.
Etrto english size french size german size rim circumference mm find tires.
Iso etrto mm english size inch french size mm 35 584.
If you use rims of other brands please send a rim profile to the tire maker for recommendations.
27 5 584 mm 650b tires.