Hey Slinke - well, since I seem to be a resident expert on the problem - I'll have a go (but hopefully others will chime in with a clearer explanation!)
Cross chaining is being in my big ring in front and the big ring in back (and vice versa, I suppose, but I don't seem to do it that way). There is so much lateral tension that the chain just jams up and the pedals don't turn, and I swear and curse and just about fall off the bike trying to get unclipped. It's not a pretty sight, let me tell you.
Oh - and it's bad for the chain and all the other moving parts too.
Edited to describe it properly - I had I backwards!



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