Just like with mechanical gears, shimano Di2, whether ultegra or Dura ace,
occasionally needs adjustment.
Even though rumors it being self-adjusting do still persist.
It's not. So here is how to make sure your di2 works perfectly.
If your gears aren't shifting crisply all the chain is making a rasping,
clicking noise as you pedal, then the chances are that correct it is just
going to take one very simple adjustment. is the problem is likely to be at the
top pulley wheel on the derailleur isn't sitting correctly underneath each
sprocket, so the noise you're hearing is actually the sound of the chain rubbing
against one of the sprockets on either side of the gear
you're actually in. If that's the case, then you need to shift into the middle of the cassette.
So perhaps the fifth sprocket out and then you need to enter adjustment mode.
Yes that's right. Adjustment Mode~ To do that you need to press and hold the
button on your Di2 junction box now, it's normally located underneath the stem
And when you do it, a little red light comes on, this means that you are in Adjustment Mode~
And you will be for the next minute or until you press and hold that button
on the Di2 junction box again.
what it means is that every time you press one of the shift buttons on your
right hand shifter, instead of actually changing gears,
the rear derailleur will move only 0.2 millimeters.
therefore allowing you to micro adjust the position of it underneath the
sprockets meaning that you can get your chain to be quiet and also shift crisply.
Look at the position of your rear derailleur from the back of the bike,
to try to ascertain which direction it needs to move.
Now if it's not clear, you can always experiment.
So the button that normally shifts you into a harder gear
will now similarly move the derailleur outboard but just by 0.2millimeters,
and then the other shift button
of course do the opposite moving in board now you can actually see the
derailleur moving but perhaps more importantly you can also hear the pitch
of the chain changed as i move it progressively more out of line
meaning that in order to correct it you simply move in the right direction
either in border outboard.
until it stops making that noise and that should mean
that you end up with crisp and silent shifting but if you want to check
I suggest you do then press the button and your junction box again to leave
adjustment mode and then you can run through the gears
to make sure they're crisp and silent.
it's worth noting that the high and low limit screws that you have on a
mechanical black are also there working exactly the same way on your Di2 bike
so you always need to make sure they are adjusted correctly
finally there is no micro-adjust function on a Di2 front mech.
If you need to adjust it,
then there are certain things that you can do instead.
So you need to check the height of the derailleur
so you want to look for a gap between 1 and 3 millimeters over the big ring
when you're in the little ring, then you also need to check the alignment.
So, the cage needs to be parallel with the big ring again
whilst in the little ring, and then you also need to check the low and high limit adjustment screws
So the lower limit should mean that the chain just doesn't rub when
you're in your easiest gear and the high limit screw should be adjusted to the
chain doesn't rub when you're in your hardest gear.
By the way, there are a number of modifications that you can make to the functionality of your Di2,
such as speeding up the shift, or indeed turning on and off the multi shift function.
To do it there, you're going to need to connect your bike up to your pc.
It has to be a pc. It won't actually work with a mac and you're going to need a
little connecting box called an SM-PCE01.
yeah it's really expensive and so in all likelihood you'll probably just want to take your bike
to your local bike shop and get them to tune it for you.
Unless of course you've got loads of Di2 bikes,
or you're really serious about tunning it. Now if you want to see a video
about how to index mechanical groupsets maybe for all time say or just actually get a little
bit more information about this high and low limit adjustment screws and we got a
great video where it goes in detail and it's just up there,
or to see how to fit an entire Di2 group set
we've got video just down there showing you exactly how finally before you go to
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