I decided to try riding my bike to work. 10 miles each way, with a big hill in the second half both ways. For the first week, I'm riding my bike to the hill, and taking the bus up it. (3 mile hill - I don't want to hurt myself the first week).
Needless to say today I got a semi-flat. When I went to the gas station, it cost 1.00 to use the air (!) and after I put in the quarters I realized it I had a different valve.
Now I know the difference, thanks to this nifty guide by Jobst Brandt.
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