What is the best option for a bike pump to take with me on rides? Do I go with a CO2 setup or just get a mini manual pump? Any thoughts on which type I go with and also any suggested models / brands?
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I'm partial to the Lezyne frame pumps. Love the hose feature they have. This one in particular is pretty much do it all: http://www.jensonusa.com/Lezyne-Gauge-Drive-HV-Medium-Frame-Pump?cs=Black
I use the Lezyne Micro Floor Drive HP. It's an awesome, reliable pump that puts out good volume. Its not too large and packs away nicely next to my down tube bottle. I've learned that the best way to store it is upside down to prevent sweat, drink, rain, and dust from settling into the pump housing. You can't go wrong with this pump.
I agree with everything said here. Mine's been field tested a few times, works beautifully, packs neatly on the downtube mount, and looks nice to boot. Never tried the one with the gauge. For 40-50 psi, the HV version works perfect, because it fills the tire relatively quickly, and when it gets too hard to put more air in, that's when you know you're somewhere near 45 psi or so. So just pump till it gets pretty difficult and you're done. Here's a pic of mine mounted:
Wow - I love the Crank Brothers Power Pump Ultra. It's a super small, light, simple, reliable pump. Nothing fancy at all, but it takes about as much space as a couple of CO2 cartridges and it's way lighter. Maybe the only drawback is that it's not great for getting really high pressures, but great for higher-volume/lower-pressure gravel rides.