Hmm, I've unclipped on the left side for 20+ years now as does hubby. No chain marks unless we're mountainbiking when you have to clip out on whatever side is necessary. Guess I don't lean the bike against me. I just plop down on the top tube if I'm standing for any length of time or have my right foot up ready to go. This also means my cleats don't slide on the downhill side of a crowned road (made worse with oil or debris).
Your front derailleur should prevent much contact with the chainrings and proper lubing of the chain helps more.



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of course, we're all sorta warped...
