Cycle pumps with reversible heads work for Schrader and Presta valves
Reversible bike pump heads can be adjusted to work with both Schrader and Presta valves by flipping the internal components.
Cycling
The left pedal spindle on a bike is reverse threaded
When installing bike pedals, the left pedal is reverse threaded - turn clockwise to loosen, counterclockwise to tighten.