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Maxxis Flyweight Tubes 700 x 18/25 - Pack of 3

At 0.45mm thin, flyweight inner tubes are the lightest butyl tubes known to mankind. Acceleration is increased because rotational weight is decreased. Flyweight tubes are packaged with a unique rim cloth strip to be used only with flyweight tubes.

Specifications:
     - Size: 700 x 18/25
     - Weight: 53 grams per tube
     - Valve: FV
     - Valve length: 60mm
     - Lightest tube available
     - Maxxis rim strip included

French valve (FV) is also known as "Presta valve" or "Pointy valve".

Avoiding Pinch Flats
Putting too much air into a tube without making sure it's seated properly in the tyre can cause a part of the tube to get pressed against the edge of the tyre. When the air pressure reaches near maximum, that pressure on the tube can actually cause the tyre to cut the tube's rubber, resulting in a "pinch flat." That's why you should put in about 20 pounds of air and then "massage" the tyre (to help seat the tube in the tyre and the tyre on the rim) before you fill it to the brim.