Question about Shimano Dura Ace Di2 ST-7970 STI

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I have set up my di2 as per instructions but on the small ring on the front and moving to second from third gear the chain keeps jumping between the cogs how do you fine tune or have I done something wrong. ta

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Dura Ace di2 front derailleur 10 speed (7970) not shifting correctly. Moving back and forth with clicking sound. How do we fix?


First, is cable tight, it may be that the cable has loosened or stretched. In this case, Put chain on inside spocket, loosen hex head bolt, pull tight, retighten hex head.
It also could be the limit screws have vibrated loose. There are two of them on the top of the derailleur. Make small adjustments in one screw, check to see if it improves shifting or makes it worse. You didn't say whether it was the small or larger spocket. The limit screws control how far in or out the derailleur moves. Read more on Shelton brown .com under derailleur heading

Sep 16, 2014 | Shimano Dura-Ace Di2 7970 Front Derailleur...

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3rd Di2 install and first 2 worked perfectly. On this bike when on big ring big cassette (23) get pretty good chain rub on front derailuer. Have tried setting tail of derailuer in more than usual and...


Derailleurs are mass-produced and are essentially identical to each other, so unless damaged it's unlikely to be the derailleur. A sticky cable could keep the derailleur from trimming properly. It also can lead you to think it's tight enough when it is not. Otherwise it's hard to diagnose remotely. Derailleur must be both at proper angle and height to shift well, cable both move freely and be at proper "tension."
Di2 Shimano Electronic Intelligent System Installation

Apr 15, 2017 | Shimano Dura-Ace 7900 Di2

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Cannot get rear derailer to work properly 24 inch girls evolution


Don't start messing with the derailleur yet! Make sure your shifting trouble isn't due to something else, such as a warped, dirty, or stretched chain, gummed-up pulleys, crud in the cable housing, trapped cable, or a bent derailleur hanger
Clean the chain and the rear derailleur pulleys. Pull the chain away from each pulley, and turn the pulley to make sure it can move freely. A pulley that offers resistance to turning must be replaced.
Now check the cable to be sure it slides freely. Mud and grit within the cable housing, or on a cable-guide, can keep the derailleur from moving a "full gear" during downshifts. If the cable doesn't slide freely in the housing, you may be able to clean or lube it to restore smooth shifting.
Let the high-gear limit screw. In your highest gear on the shifter, and with the chain on the smallest cog, position the derailleur so the upper pulley exactly matches the teeth of the small cog. Run the chain a bit with the front derailleur in the large ring, adjusting the limit screw until the pulley and the cog seem to match perfectly.

Setting the high-gear (small cog) limiting screw.



Once you're sure the derailleur matches the cog, move it just a whisker (1/8 to 1/4 turn) towards the other cogs. (You may need to readjust a bit if you get chain-skip.)

Closeup of setting the limiting screw.



Now adjust the low-gear limit screw. Shift into the lowest gear (largest cog). If it won't go, loosen the limit screw. With the chain on the largest cog (and the front derailleur in the small chainring), adjust the derailleur so the upper pulley exactly matches the teeth of the large cog.Once it's perfect, turn the limit screw so it moves the derailleur a tiny amount towards the other cogs (1/8 to 1/4 turn usually works).

Setting the low-gear (largest cog) limiting screw.



Now shift to the highest gear (smallest cog). Push the shift lever to downshift one gear (go from the smallest cog to the next-smallest). If it doesn't shift, tighten the cable with the barrel adjuster, 1/2 turn counter-clockwise. Backshift and try again. Continue tightening until it shifts. If it overshifts, going from the smallest cog to the third-smallest, loosen the cable by turning 1/2 turn clockwise. Backshift and repeat until it shifts exactly from the small to the next-smallest cog.

Fine adjustment of tension in the derailleur cable.





Now go to the second-smallest ring. Tighten or loosen the cable slightly, until the outer side plates of the chain are just clearing the third-smallest cog. Shift up and down, fine-tuning until you're satisfied.

Checking the position of the chain on the cogs.





Mar 04, 2011 | Pacific International Pacific Evolution 24...

1 Answer

Colnago C50 with 11 speed choras group set. When changing up to the big chain ring ready to decend whilst still in one of the largest 2 or 3 rear sprockets the chain...


Is the chain falling off to the outside? if it is you can adjust the "High " limit screw on front derailleur. There are two screws on top of derailleur usaully marked with a L or a H.Shift rear to small cog and front on large ring. Slowly turn screw marked H till you see front derailleur move in. When it starts to rub on chain back off 1/8 of a turn. Run the rear up and down a cuople of gears making sure nothing rubs and adjust accordingly . Same with the front. That should do it! Also when changing to the big ring up front you should try to be on a middle to small cog on the rear so you don't get into a "cross chain" situation. When running on the small ring you should be on large to middle on the back. Hope that helps you out.

Sep 13, 2010 | Colnago Freeship Ferrari Cx-20 Bicycle...

1 Answer

Sometimes when shifting from middle ring to small ring the chain gets stuck between the two rings.


Going down, shift fast and keep that chain moving, If the derailleur isn't throwing far enough, fast enough, get some oil in there and move the adj screw a hair in, so that the chain will move over a hair and not fall off the other side. I was just out on my bike and couldn't believe how nice it stills shifts after 25 years. Original parts. Hope this helps.

Aug 30, 2010 | Shimano Deore LX Mountain Bike Front...

1 Answer

My shimno sora front derailler shifts perfectly to the small and large chain set cogs, but on the middle, the chain rubs along the cage.


Set the rear derailleur to the lowest gear (big cog) and the front to the lowest gear (small chain ring). Disconnect the derailleur cable. Screw in the adjuster for the cable tension all the way (this adjuster is on the shifter of a mountain bike or the down tube of a road bike). Pedal to make sure the chain is not rubbing on the derailleur cage. If it is, adjust the "L" setting on the derailleur until the chain moves by without touching the cage. Now pull taut and reattch the cable and shift the front to the big ring while pedaling. If it does not shift up well or completely, hold the shifter past its normal shift and adjust the "H" screw so that the derailleur allows the shift. Shift into the highest cassette gear and keep pedaling. The chain should not be touching the front derailleur's cage when you pedal. Adjust with the barrel adjuster until the chain moves freely without touching the derailleur cage.

i hope this helps
-matthew

Oct 30, 2009 | Cycling

1 Answer

Problem with chain and gears


Wash, degrease and scrub the chain and derailleurs with a good degreaser (like Simple Green). Dry the chain and relubricate it with an appropriate bike chain lubricant (not oil or WD-40). Shift the derailleurs to the smallest chain ring and cog on the cassette (low front gear, high rear gear) and then loosen the cable at the derailleurs, pull the cables taut and reattach them. If the derailleurs still need adjustment, here is a procedure for it:
Flip the bike over (so you can pedal the bike manually while you shift) and shift the front to the middle chain ring. Shift the rear to the highest gear (small cog). Release the cable from the pinch bolt on the derailleur. Adjust the screw marked "H" on the derailleur until the jockey wheel on the derailleur is aligned perfectly over the small cassette cog. Set the cable adjuster on the derailleur to the middle of its range (find this by screwing it all the way in and then count how many revolutions it makes until it screws out completely. Screw it back in one half of the total revolutions). Reattach the cable and shift to the lowest gear (the biggest cog). Over-shift and hold on the shifter, then adjust the "L" screw on the derailleur until the jockey wheel sits just past the last cog. You have to hold the shifter to do this. Now shift into the middle gear (or one of the two middle gears if the bike has an even number of gears) and adjust the derailleur using the barrel adjuster you previously set to the middle of its range. Adjust it so that the derailleur is sitting perfectly over the appropriate gear. Shift up and down the cassette while pedaling and in every gear, reverse pedal (freewheel) to make sure the chain does not hop. Adjust as necessary until all gears are smooth.
Now the front:
Set the rear derailleur to the lowest gear (big cog) and the front to the lowest gear (small chain ring). Disconnect the derailleur cable. Screw in the adjuster for the cable tension all the way (this adjuster is on the shifter of a mountain bike or the down tube of a road bike). Pedal to make sure the chain is not rubbing on the derailleur cage. If it is, adjust the "L" setting on the derailleur until the chain moves by without touching the cage. Now pull taut and reattch the cable and shift the front to the big ring while pedaling. If it does not shift up well or completely, hold the shifter past its normal shift and adjust the "H" screw so that the derailleur allows the shift. Shift into the highest cassette gear and keep pedaling. The chain should not be touching the front derailleur's cage when you pedal. Adjust with the barrel adjuster until the chain moves freely without touching the derailleur cage.
That should be it, unless there is another mechanical problem causing the missed shifts, like a bent derailleur hanger or damaged teeth on the cassette cogs or a bad derailleur. If it is still problematic, come back for further information.

i hope this helps
-matthew

Oct 26, 2009 | Cycling

1 Answer

Throwing chain too far on an upshift up and off


The "H" screw is the one that is letting your chain jump of f of the ring. If the screws are not labeled, the way to distinguish the two is to shift the front as high as it can go and hold it there manually. Screw either adjusting screw in. If you are screwing the correct one, it either will not move at all or move only very slightly.
First thing is first: flip your bike over onto the bars and saddle. The best method to adjust these settings is to shift into your small ring and let loose the shifter cable. Now shift your rear derailleur into the lowest gear and manually pedal the bike while adjusting the "L" screw on the front until the derailleur cage allows relatively free rotation of the chain. Now set the barrel adjuster on your down tube fully turned in (clockwise). Pull the cable taut and reattach at the derailleur. Shift into your middle ring (or high ring if you have a double-ring crank) and then shift the rear to the highest gear. Use the barrel adjuster to get the derailleur cage to just clear the chain while cranking. If you have already succesfully set your "H" screw to a point where the chain no longer jumps off, then you are all set here. If not, hold the front shifter in while cranking and set the stop so the chain cannot get off of the big ring, but far enough out so you can purposely over-shift by just a bit. Sometimes if you shift early, that little bit of over-shift is very helpful.

i hope this helped, but if you would like to see pictures of this happening, go to parktool.com/repair and check out their tips on derailleur adjustment.
matthew

Oct 22, 2009 | Campagnolo Record Front Derailleur

2 Answers

On my bike with shimano ultegra shifters and 105 front deraileur, I can't shift onto the big chainring. The deraileur is not at the stop, but I can't move it any farther. How do I fix that.


Try this first:
Shift into the little 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 down tube. 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.

Jun 23, 2009 | Shimano 105 Triple Braze On Front...

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