I gotta get better at carrying more tubes and possibly three cartridges. Being 20+ miles out (I always flat when furthest out) with a flat can be unnerving at best.
I had my first CO2 dud several weeks ago and it almost cost me dearly, until a nice fellow happened by and helped me out. I currently don't carry two tubes, but heavily considering it. Also changing tires out more frequently when signs of flattening occur.
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Ride hard and ride on......