I am very dirty ...

after changing the tube on the rear tire of my bicycle ... twice this afternoon.

Brand X - Initial bad tube had a pinhole near the valve stem.

Brand Y - First replacement tube (the spare I had been carrying on the bike) had a pinhole in almost the exact same place ... which I only discovered after getting very dirty in changing the tube and putting the tire back on the bike and everything.

Brand Z - Second replacement tube holding air ... so far.

Total time elapsed == approximately two hours.

My bicycle mechanic skills == almost none.

My "Sheldon Brown"ness == 0.01%

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