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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-26-12, 09:57 PM   #1
RoboCheme
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Can Di2 self adjust?

Back in March, I had my Rival group replaced with Ultegra Di2 and I'm very happy I did.

A few weeks ago I started to have a problems with some gear slipping. Basically, it wouldn't stay in a certain gear, and the problem wasn't consistent. Then it got worse; I was doing some hill repeats and the RD wouldn't stay in the biggest cog.

I took it back to the LBS, but the lead mechanic wasn't in and the other guys said that they don't touch Di2. It did jog my memory that the lead mechanic did show me how to make small adjustments to the RD. The Shimano written instructions didn't say anything about it, but Google came through (push and hold the battery check button and then hit the right shift buttons to adjust the RD up or down).

What's odd is that as soon as the five seconds were up, the RD starting moving up to the big cog and the light went out. I was turning the crank all this time. I never did get a chance to hit the shift buttons.

The positive slant on this is that the problem went away. So, when the RD started marching up the cassette it seems to have fixed itself. Is this normal behavior?
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Old 09-26-12, 10:43 PM   #2
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As you see there is self trimming built in, based on properly set limits, which the RD uses to "find" sprockets and calibrate itself. But it isn't magic, the other adjustments maus be done in advance then it can set the trim by itself.
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Old 09-27-12, 06:02 AM   #3
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by holding the button you put it into crash saver mode this reconnects the linkage from the servo to the derailer. you must make sure the hanger is straight before you do this or it can throw it into the spokes. to adjust the index all you need to do is hit the button for 1/2 a second or so
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Old 09-27-12, 12:10 PM   #4
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Thanks, guys.
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