Originally Posted by
oldacura
I guess that I'm more old-school than others when it comes to electronics. We almost always ride in familiar territory so an map function is unnecessary. Stuff like power output etc. will only confirm that I am getting older & slower.
We have really only ridden around the block with the new bike & Di2. I hope that I don't regret this decision. One think that I like about bikes is that they are one of the last truly mechanical toys available. Now I have allowed electronics to creep into this and it is not just a gadget - it is integral to the functioning of the bike.
I just rode my older single bike yesterday. It is 2 x 10 Durace. I can run small front ring with all but the smallest rear cog with no noise. Now it appears that on the tandem I can't use any of the 3 smallest rear cogs with the small front ring. Is this because of Di2 or something else? If this is a compromise of Di2 why is this not made clear by Shimano and all of the early adopters?
Did you try my test from a previous post? If the cage isn't touching the chain, then it's not a Di2 problem.
(I never noticed a noise from small-small cross chaining on my old Campagnolo 10 speed with 50/34. But the lift pins on the FSA chainring didn't stick out as far, either.)
To test: Off the bike, shift to the small-small combination. Slide a dollar bill in between the front derailleur cage and the chain to verify it's not touching. I can see a gap of maybe 1mm, or about the thickness of the chain plate.
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If the cage isn't rubbing, I'd contact Calfee. They must have taken chain lines, bottom bracket widths, and other relevant design parameters into account when designing the bikes.