Crank Brothers Gem L & S Mini Pump Crank Brothers is known for making high quality and innovative products. Their tools and pumps are not exception. The Gem L and S mini pumps are great pumps for mountain and road. With a max pressure of 115 psi, you can dial in you desired psi with no problem. L: Long Piston, 205mm, 155g S: Short Piston, 176mm, 128g Max PSI: 115 Warranty: 5 Year through Crank Brothers | Crankbrothers | Gem Pump Green, Short