A bicycle pump is necessary for the cyclist at home to be able to inflate the tires.
In addition, a lightweight pump is essential with long bike rides after a puncture, to paste the tire and inflate again.
For the consumer, there are large pumps with foot bracket so that the tire can be inflated at home and small frame and mini-pumps designed to carry on the bike (Fig. 30).
The bicycle pump consists of a cylinder which is connected at the end via a nipple or a hose with the valve.
With a piston, the air can be compressed until the pressure in the pump is greater than in the tire.
At that time, the valve opens and air flows from the pump in the tire.
The ordinary hand pump may be provided with a valve clamp which is only suitable for the Dunlop valve.
There are also pumps with high quality rubber cup that is placed over the valve.
With such a pump can, tires with Dunlop valve, French valve and Schrader valve to be inflated to a maximum of 16 bar. Frame Pumps can for ordinary bikes have a tube that runs on the valve and the pump.
The tube is stored in the handle of the pump. Frame Pumps for bicycles with a French valve having a rubber cup that is pressed to the valve. These pumps can also properly inflating tires with ordinary Dunlop valve.
Good pumps have a clamping mechanism with which the rubber head is clamped on the valve. This allows the pump to inflate the tire much harder.
In order to measure the pressure, a separate pressure meter on a French valve and Schrader valve can be pressed.
A small amount of air then flows into the pressure meter until the pressure in the tire and the meter is the same.
The pressure in a tire with Dunlop valve can not be measured in this way.
Quality pumps are equipped with a pressure gauge while pumping the pressure in the pump – displays (Fig. 31).
Because the air from the pump in the tire flows when the pressure in the pump is higher, the meter also measures the pressure in the tire.
Frame Pumps to carry on the bike, are sandwiched between the frame tubes (Fig. 32).
On City Bikes the bicycle pump is clamped between the ridge and the bottom bracket.
With racing bikes and hybrids, the pump is placed between the seat tube and head tube or clamped between the bracket and the top tube.
Frame Pumps are available in various lengths, so that you will always find a pump that can be clamped between the frame.
Due to the deviating shape of a mountain bike frame the ordinary bicycle pump can not be clamped between the frame tubes.
On mountain bikes can be fitted a clamp for a mini-pump. Mini pumps are small and portable and can therefore be transported easily.
There are also mini-pumps with double stroke. These pumps at both the ingoing and the outgoing stroke of the telescopic tube.
Pumps wear at the piston and at the head. By lubricating the piston with Teflon you can prevent this wear.
The rubber cup can be easily replaced. Pumps for home use a hose that tend to leak at both ends of the hose.
By mounting a hose clamp, the hose may be much better to be attached to the pump and the clamp valve.
Figure 33 shows another valve clamp for a Dunlop valve and a multi-functional valve clamp.