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Bike Tubes 700

CST brand 700 x 19/23 Tubes - Smooth Presta Valve 48mm - Pack of 3

With a 0.90mm wall thickness these are the most popular tube for general purpose riding.

Specifications:
     - Size: 700 x 19/23
     - Weight: 98 grams per tube
     - Valve: FV
     - Valve length: 48mm
     - Valve type: Smooth

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

CST is the manufacturer of Maxxis, and high quality is guaranteed.

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.