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#16
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Well, considering that the 9100 RD is now only available in one longer cage length that goes to 30t, the mid-cage 6800 mech shouldn't look too "fred" on most bikes.
But Shimano is conservative with their recommendations and 6800 is a bit different in ways than 9100. It may come down to the tiny details that I mentioned, and even the shifting speed (toward smaller cogs, presumably) has been mentioned in company literature to be a function of the weight of the cage together with the length of chain that it carries. Just like similar claims that newer, lighter shift levers improve a bike's steering, really! |
#17
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my only gripe with my medium cage setup is that it does not seem to hold the same chain tension as my short cage. On bumpy roads, I lose the chain off the front big chainring with the medium cage but not the short cage (same road, same bike, same FD setup). Could be just a weak spring in my particular derailleur, because I don't know why they would design it that way.
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#18
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#19
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It's been my experience that a shorter-cage derailer, as with a "GS" vs. "SGS" cage, does a bit better with controlling chain slap noise on an off-road bike.
But as far as having the chain come off (not while shifting) on a road bike, it sounds like something else must be wrong, such as a bent chainring/tooth, bent chain or poorly setup front derailer. |
#20
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This has happened to me a lot on my gravel bike. So much so that I try to remember to shift to the big ring when descending. I coast along and then when I try to pedal the chain is off. I switched to Di2 and the problem seemed to go away. But has come back again on the last couple of rides. I'm hoping Shimano makes a gravel RD - basically an Ultegra w/a clutch. But am not holding my breath.
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