Carry valve extenders. Personally, I use them all the time on my 55 and 66 wheels, as you can't buy latex tubes with 80 mm stems. In 30 or 40K miles, I've only had one extender ever leak, and that was because I went too long without just checking to be sure they were tight.
BB
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Formerly fastest rider in the grupetto, currently slowest guy in the peloton