Size - ETRTO ( Industrial )
The European Tyre and Rim Technical Organisation (ETRTO) is an international institute which standardizes the sizes of tires. The ETRTO sizes are very precise because the sizes are based on the diameter of the rim instead of the outer tire. An example could be 42-622. The first number here stands for the width and height of the tire in mm and the second number for the diameter of the rim in mm.
Which innertube fits my tyre?
Once you know the ETRTO-code of your tire you can determine the size of innertube you need. Because innertubes are very stretchable they can always fit a range of widths and sometimes even wheel diameters. Some tubes will display 28-622/630 or even 20/28-622/630. These numbers show a range of rim diameters and tire widths in which the innertube will fit.
Size - mm ( Race )
This measurement looks a lot like the ETRTO sizes but are only used for road cycling nowadays. Just as the ETRTO system the diameter of the rim is used. For example 700 X 25C could be a size. The first number is the diameter from the outer tire in mm and the second number is the width of the tire in mm.
Size - Inch (") ( MTB )
The classic method is to measure in inches. This is nowadays mostly only used in the MTB world and USA. This is how it works: the size is made up of two or three elements. Always think of the wheel diameter and the width of the tire. Sometimes a third is used and that would be the height of the tire. An example of this could be 28X1½ or 28x1½x1¾. The first number is an old measurement of the outside diameter of the tire. The second number is the width of the tire and the third number is the height of the tire.
Presta valve / FV
For the Presta valve (also known as French valve) we use the shortcut abbreviation. This type of valve is mainly used on road and touring bikes. An innertube with this type of valve is suitable for high pressures. When inflating an innertube with this valve you need to open the valve by unscrewing the nipple on top.
Available in: 33 mm, 48 mm, 60 mm and 80 mm lengths. R - Removable valve for use with extenders.
Schräder valve / AV
or the Schräder valve (also known as Automotive valve) we use the abbreviation AV. An innertube with this type of valve is mainly used on cars. The type of bikes that make use of these valves are mountain bikes and other kinds of bikes with wide tires. This type of valve makes it easy to inflate your tube at a gas station without any use of extenders.
Available in: 33 mm, 48 mm, 60 mm and 80 mm lengths.
Dunlop valve / DV
For the Dunlop valve (also known as Dutch valve) we use the abbreviation DV. This type of valve is known for its wide usage in the Netherlands. most urban bicycles and e-bikes in the Netherlands (and other countries) use this kind of valve. You can use any floor pump to inflate innertubes with this valve.
Available in: 31 mm and 40 mm lengths. BV - Bent Valve.