Lezyne Gravel Digital Drive Pro Floor Pump Black. The Sport Gravel Digital Drive is a high quality bike floor pump with a medium sized barrel designed specifically for gravel bikes and other mid-volume tires. Pumping is versatile and more efficient thanks to an extra long hose and a larger 3.5 Digital (88.9 MM) gauge which provides detailed measurement up to 100 PSI (6.9 BAR).