The Lezyne speed drive CO2 looks like a very nice package for the minimally minded. CO2 pumps don't get much smaller or much lighter. It accepts all threaded cartridges, but only works on Presta valves.
In theory, operating instructions are pretty straightforward: screw cartridge all the way into head, pop on the valve, unscrew half a turn, tyre rock hard in seconds, off you go. I didn't find screwing the cartridge in that easy in the first place and when I did the CO2 came straight out. After trying this twice, once with a Lezyne cartridge and once with another brand cartridge, both time with the same results, I called it a day. I expected that I had a duff one and when the replacement duly arrived it did seal when the cartridge punctured, allowing you to inflate the tyre. Even then, though, it doesn't give a great deal of control and sealing is still a bit hit and miss. I wouldn't want to rely on it.
Another downside of a minimal design like this is that it will freeze to your hands if you're not careful, definitely make sure you're either wearing gloves or you stick your jersey or something in between your hands and the cartridge. Call me a wuss, but I don't trust things under pressure all that much. Above all else, I need two things from a CO2 pump: I need to feel in control, and I need to trust it's going to get my tyre inflated when I need it to. This pump fails on both counts for me. Lezyne's more substantial Alloy Drive is a much better bet.
Very minimal, but difficult to operate effectively.
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Make and model: Lezyne Speed Drive CO2
Size tested: n/a
Did you enjoy using the product? Not really
Would you consider buying the product? No, I'd go for the Alloy Drive
Would you recommend the product to a friend? No
Age: 32 Height: 1.78m Weight: 76kg
I usually ride: All of them! My best bike is: Cervelo Dual
I've been riding for: Over 20 years I ride: Every day I would class myself as: Expert
I regularly do the following types of riding: time trialling, commuting, touring, club rides, fixed/singlespeed, Audax