The SKS Rookie XS Mini Pump has an ultra compact design making it shorter and slightly more pocket friendly than the XL model.  The immediate pressure build-up and high volume per stroke makes it efficient and easy to use. This SKS Mini Pump is compatible with both Schrader and Presta valves thanks to its reversible valve head and is supplied with a bottle cage mounting bracket.  SKS Rookie XS Mini Pump Features Compatible with Schrader / Presta Reversible valve head Maximum pressure:  6 bar / 87 psi