Went for a ride with my friend for 50 miles.

We had about 34 miles and stopped to refuel at a rest stop in the park. We were about ready to take off riding and my friend noticed his tire was flat. He just got a new wheel set on Thursday, so he was pissed. He never had to inflate a tire with the co2 and either have I. So he screwed the nozzle on and put it on the tire. It didn't inflate the tire. He went to unscrew the co2 canister and bam, he had it pointed close to me and it flew right by my head. Scared the crap out of me.

Ended up having to call his gf because he couldn't figure out my canister either.

Anyways how do you inflate tires using those co2 cartridges? Do you put the nozzle on the tire first then screw the cartridge in?