Question about Shimano Dura Ace Di2 ST-7970 STI
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Posted on Jan 02, 2017
What kind of gear switcher do you have?
It sounds like the problem might be there...
That should be the part that keeps your chain in the proper gear..
Does the Switch stay in place or does it go back?
if it does....
Is the cable properly tightened to the raer derailleur?
If so is the cable crimped to loose so that there is to much **** in the cable?
Posted on Jul 11, 2009
Try this first:
Shift into the small ring and release the cable. Pull it tight (with pliers) and re-tighten the cable. It should shift now. If it doesn't, the solution is a little time consuming, so i apologize in advance.
First, flip your bike onto the bars and saddle. Now shift into the small chainring and your lowest cassette cog (the largest in number of teeth). Release the cable from the front derailleur and set the adjustment knob for the front derailleur to its center point. You should find it on your shifter. Now adjust the "L" setting on the derailleur while turning the crank so that its stop sets it in a position where it just skims the chain but does not touch it. Now pull the cable taut and re-clamp the cable. Shift into the middle ring and shift the rear derailleur to its highest and lowest gears, making sure the chain does not rub the front derailleur. If it does rub (it will be in either the lowest or highest cog on the cassette), adjust the front derailleur by way of the adjustment knob to clear the rub. Then shift into the big ring and you should have no problem. Set the "H" stop if necessary.
Posted on Sep 12, 2009
Set your shifter to the highest gear while turning the crank. If you have to, manually set the derailleur to the highest gear.
Release the derailleur cable by loosening its screw.
Pull the cable taut and re-tighten the screw that clamps the derailleur cable.
You should be all set.
The cable stretches over time. This can be avoided by "pre-stretching" new cables. To do this, simply shift into first gear and pull the derailleur cable away from the frame (where you are able to do so) fairly hard, several times. Then you just release and re-tighten the cable like mentioned in the steps above.
Posted on Sep 14, 2009
check the cable first ,take out the cable in the housing to see if the cable is good,then put it back ,then check the adjuster screw (there is a 2 screw in the front derailleur adjust it.
Posted on Feb 11, 2010
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