The 40cc Wolf Tooth Mini Pump isn't the absolute smallest there is, but it's about as small as a pump can get and still be useful for big soft tires. We also sell the One Up pump, which we like as well, but this one is almost half the size and it's 40 grams lighter. Think of this pump as an insurance policy. You don't wanna use it, but if you have to, it's there. Not for use with road bikes with high psi's, and really too slow for fat bikes. Get a One Up 100cc for that. It moves noticably less air than the 70cc or 100cc One Up pumps, but on a recent bike packing trip, I had to use the pump to get 29 x 2.2 tires inflated from about 3 psi to 20, and the pump did the trick. Afterward, it disappeared in my tool bag and I never thought about it again. It's that small, that light. Features: rebuildable, with actual replacement parts available. Tiny: Fits in most tool sacks. Presta only. No locking head, just press it on. Works well. Sealed against the elements, important if you strap it to your frame using the provided water bottle cage adapter. Removeable plug on the bottom of the pump lets you stash things inside, albeit small things. Chain links, love letters. That sorta thing.
