సైకిల్ పంపు: కూర్పుల మధ్య తేడాలు

Also known as a floor or track pumpపంపు. To operate the user rests the base of the pumpపంపు on the floor, resting feet at the base, and pulls and pushes full strokes with handles. An additional tube must connect the pumpపంపు to the fill valve, which may create dead volume.

There are two basic types: tubed and integral. The tubed type requires a separate tube to connect the pumpపంపు to the valve. These have the advantage that they are cheap, but are inefficient compared to other pumpsపంపులు. They also have a lot of joints from which air can escape.

Integral pumpsపంపులు have a hole in the side with a rubber washer that fits round the valve. This is frequently compressed on to the valve by an extra lever. Because it is well sealed, rigid and have little dead volume, this type of pumpపంపు is very efficient. An 8" integral will typically pumpపంపు faster than an 18" tubed.

A simple pumpపంపు has a cupped fiber or plastic piston. On the forward stroke the air pushes the sides of the cup against the cylinder, so forming a seal; it provides its own valve. Then this piston can push the air out of the hole at the far end.

Some of the most efficient pumpsపంపులు are double action pumpsపంపులు. By sealing the piston in the cylinder at both ends they can force air into the tire on both strokes.

Pumpsపంపులు can be fitted to a bracket on the bike frame, either clamp on or a [[braze-on]] peg, or carried by the rider in a backpack, pocket, etc.

=== Foot pumpsకాలి పంపులు===

These pumpsపంపులు are often not specifically designed for bicycle use. They do not generate very high pressures so don't work well for narrow road-bike tires, but are fine for large low-pressure tires as found on mountain bikes.

Because they are designed for cars they fit schrader valves. If the bicycle has presta valves a small brass reducer is required in order to use the pumpపంపు.

These pumpsపంపులు are often used by mountain bike or road bike racers that need to save weight, and time if they get a flat tire during a race. They can be a one time use pumpపంపు - or a re-usable pumpపంపు with the purchase of another cartridge. Because they use [[CO2]], some of the pumpsపంపులు can be a little expensive. Most use standard threaded 16g CO2 canisters, originally designed for soda water fountains. Because CO2 leaks out of a rubber inner tube more rapidly than air would (despite its larger size, the CO2 molecule is slightly soluble in rubber), the tire goes flat again within just a few days.