Our Boundary 1.5HP is designed for the high pressure of road tires and capable of reaching 120PSI / 8.3 bar. An extendable head means it's easier to pump and the sealing lever doubles as a protective cover to keep it functioning no matter the conditions under tire. An additional sleeve seals the barrel to prevent water penetration. MaterialAlloy barrel and handleValve typeExtractable Presta with sealing leverMaximum Pressure120PSI / 8.3 barWeightSmall 73g approx.Medium 91g approx.SizeS, MFeaturesHigh Pressure construction optimized for road bikesInnovative new sealing lever doubles as protective head cover protecting against water and dirtExtra barrel sleeve avoids water penetration during bike washesExtractable head reduces the risk of damaging valve stem during inflationDimensionsSmall 170mmMedium 200mmAir volume per strokeSmall 19ccMedium 26.5cc