Anybody had issues using eTap with the SRAM RED 10-speed crank? Planning to upgrade next week but a little concerned reading some threads of rubbing, dropped chains etc.
i use it with both bb30 and gxp 10-speed cranks, it's fine - i had an initial problem with the limit screw, but it was easily fixed by taking a couple of mm off the screw, that was on initial release of etap, i'd hope sram would have addressed that by shortening the screw, but you never know
by now i think it is clear that overall frame geometry makes a difference (certainly it's behind the limit screw issue), etap may be fine on one frame but hard to set up on another, in extreme cases it simply may not be compatible - sram publishes frame fit info, but doing all the measurements will only confirm a frame is in spec., even a non-compliant frame could still work fine
i would say the vast majority of people have no issue, otherwise ww/other places would be swamped with complaint, whereas there're not that many posting about issues that can't be resolved (leaving aside posts about simply repeating what "x" said rather than based on actual personal usage)
wrt chain drops, unless the fd mount is flexing under load, i'd think the most likely cause is a set-up issue, the fd does seem fiddlier to get set just right, but i've had etap running now for c. 18 months, it's been fine
i've had a few trips with the bike box so it gets taken apart and rebuilt each end, but alignment rd/fd is maintained perfectly, unlike mechanical systems
whether electronic or mechanical, and irrespective of manufacturer, no system is perfect, you'll find people having issues/complaints with all of them
i'm really very happy with etap!