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.
This is not a light pump which everyone seems to want. But it really works and you don't kill yourself getting to 80psi. For the extra 100g you get to skip all the frustration of mini pumps that just don't quite work.
PROS: Good Handle, Easy to Pump, Rugged
BEST USES: City Bikes, Mountain Bikes, Not Just Bikes, Road Bikes
I think the pump must be set up for schrader valves, because it does not work out of the box with presta valves, you have to unscrew the top and take out and flip the rubber bushing and also the hard plastic under the rubber bushing. once that is done you can use it on presta valves. it has a high volume and low volume pump option.
A buddy burped his tire and needed to put some additional air in it. This would have been the first use of the pump. Neither of us could get it to seal. We tried swapping the insert back and forth but it would not seal. By the time we gave up, his tire was basically completely flat from trying to use the pump and the internal piece that opens the tire valve fell out of the pump.
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