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==Passt der Schlauch?== | ==Passt der Schlauch?== | ||
[[Bild:Tube fit small.jpg|right|Zwei Schläuche vergleichen]] | |||
How can you measure an inner tube to check whether it will fit a tire? To give an example,: the ISO 520 mm size, commonly used on bicycles, and the 540 mm size, more commonly used on wheelchairs, may both be marked 24 x 1 1/8". | How can you measure an inner tube to check whether it will fit a tire? To give an example,: the ISO 520 mm size, commonly used on bicycles, and the 540 mm size, more commonly used on wheelchairs, may both be marked 24 x 1 1/8". | ||
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Putting an inner tube inside a tire without installing the tire on the rim makes a quick check possible. Inflate the tube only enough so it barely holds its shape. It should fit en-tire-ly (sorry) inside the tire. The tube in the photo below is made for an ISO 540 mm tire, and does not fit the 520 mm tire. The tube should also just barely fit the rim. | Putting an inner tube inside a tire without installing the tire on the rim makes a quick check possible. Inflate the tube only enough so it barely holds its shape. It should fit en-tire-ly (sorry) inside the tire. The tube in the photo below is made for an ISO 540 mm tire, and does not fit the 520 mm tire. The tube should also just barely fit the rim. | ||
[[Bild:Tube to big.jpg|left|Der Schlauch passt nicht in den Reifen]] | |||
The photo at the right shows a quick way to determine whether the diameter of two inner tubes matches. The longer tube was for a 540 mm tire, and the shorter tube, 520 mm. If you need to measure a tube by itself, its length when held out straight should be half that of the bead-seat circumference of the rim, plus no more than half the tire's width. The circumference is given in a table in the rim-sizing article on this site. | The photo at the right shows a quick way to determine whether the diameter of two inner tubes matches. The longer tube was for a 540 mm tire, and the shorter tube, 520 mm. If you need to measure a tube by itself, its length when held out straight should be half that of the bead-seat circumference of the rim, plus no more than half the tire's width. The circumference is given in a table in the rim-sizing article on this site. | ||