Among the track pumps (floor pumps) on the market, I see one advertised with the following feature:
foot-activated high-pressure/high-volume switch
I'm interpreting this to mean that the pump has two modes:
- High pressure and low volume, suitable for pressures between 80psi and 160psi.
- High volume and low pressure, suitable for pressures between atmospheric and 80psi.
Is this interpretation about right, and does this feature make it more attractive than other models for someone who'll use it mainly for road bike tires, but also occasionally for mountain bike tires?
I'm intrigued by how they achieve this, since a first guess of how to build it would involve changing the diameter of the tubular air compartment, not exactly something that can be obtained by a switch. But that's for another question (perhaps on some mechanical site).