A compact, lightweight hand pump with an efficient, overlapping Composite Matrix handle, the HP Drive features a CNC-machined aluminium barrel and piston and is optimised for high-pressure applications. It’s quipped with our ABS Flex hose which is both Presta and Schrader valve compatible.Lezyne offers both a HP and HV version of every bike pump for both road and mountain bikes.HP stands for High Pressure: Road bike tyres are thin, low volume, and require higher pressures to run well (anywhere between 90 and 160 PSI). Their HP pumps are designed to make it easier to pump up road bike tyres to those pressures by using smaller pump barrels.HV stands for High Volume: Most mountain bike tyres these days are run between 2.0" and 3.0" wide. Requiring so much air to fill up these tyres, they developed their HV pumps with bigger pump barrels to push more air into the tyres, making inflation of mountain bike tyres faster and easier.