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chain drop, not enough spring tension in RD to retain the chain, my experience wasnt with etap but with 6870 and a narrow wide ring, I also did the spring tension hack that you can do with shimano RDs and this was all bumpy road .. you really need a clutched mech to run 1x
amey-
lol no. user error.
funnily enough I was riding a 1X etap bike around between posting that comment and your response. I've ridden 6870 1X too. You just need to run a tighter chain, which electronic groups and especially eTap prefer anyway. It's fine.
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Bollocks to that. Used to run 1x 6870 off road and not dropped a chain once. Also just built a 1x etap for a customer for CX and first thing he did was ride it down some stairs as shakedown. Guess what didn't happen?
MechaMorgan
Chak
why would running eTap 1X be a bad idea?