Inflate A Bike Tyre With A Presta Valve Or Sports Valve
Check The Valve & Deflate The Bike Tyre
Find the valve and remove any dust-cap.
Connect The Pump
The hose or pump connection may screw on or press on. Some push fit connections lock with a cam lever. To check the correct operation of the connection look at the rubber washer and move the lever back and forth. The the ‘locked’ position squeezes the washer, the ‘on-off’ position lets the washer relax. The rubber washer in a pump connector wears out with use. It needs to be replaced when it stops gripping valves to give an air-tight sea.
Floor or Track Pumps
Place both feet on the rests to stabilise the pump. Open the pump fully at the start of each stroke. As you get to the bottom of the stroke you can use your body weight – rather than your arms – to force the last bit of air out of the chamber by softening your knees.
Many modern pumps can be converted between Presta and Schrader fitting, by dismantling the connection and reversing the direction of parts.