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Adjustment of the derailleur - Shimano Dura Ace Di2 RD-7970

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Chain intermittently slips in all gears. Is there an adjustment


Mark:

First of all, make sure that you are not over or under shifting. The chain has to be positioned exactly over the gear that you are trying to use. If you hear derailleur or chain noise The derailleur is not "in gear" and you have to adjust your shifter to eliminate noise. The derailleur must be adjusted so that the chain is parallel to the gear cluster in each gear. If the chain is twisted at all, it will skip gears. Check your rear derailleur to ensure it is pointing the chain directly at the front gear cluster. Check the front derailleur to see that it is pointing the chain directly at the rear derailleur. While you are at it... clean the derailleurs with alcohol and lube them with a light weight oil. Check the derailleur stops (small screws next to the cable clamp on the derailleur). Have the bikes rear tire off of the ground and pedal the bike with one hand while shifting with the other hand and you can see what the derailleur is doing. adjust the stops so that you can not shift the chain off of the gear cluster in high or low gear. You may have to adjust the cable length at the derailleur cable clamp, and at the adjusters on the shifter to get the exact adjustment that you want. It will take some time to properly adjust your derailleurs, but it is worth it when you can ride without your derailleurs acting up.

Jun 15, 2015 | Cycling

2 Answers

Ezip


Since you didn't specify which derailleur needed adjusting, I have included links to adjusting both the front and rear derailleurs.
Park Tool Co ParkTool Blog Front Derailleur Adjustments
Park Tool Co ParkTool Blog Rear Derailler Adjustments derailleur

Apr 13, 2014 | Cycling

1 Answer

Front chain rack sistem adjustment


I am assuming you are referring to the front derailleur. Here is a link to adjusting the front derailleur:
Park Tool Co ParkTool Blog Front Derailleur Adjustments

Apr 09, 2014 | Genesis 26 Inch V2100 Dual-Suspension...

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My rear derailer needs adjusting, it slips in between gears.


As mentioned above, it could be many causes but assuming that the drivetrain is in proper working condition it is a simple matter of cable adjustment. If your derailleur has a "barrel adjuster" on it your good to go. This is usually a plastic sleeve that sits right before the cable housing enters the derailleur body. If you shift to a higher (smaller) gear & the chain doesn't follow you want to turn the adjuster the direction that you want the chain to go! In that case it would be clockwise. If you shift to a lower (bigger) gear & the chain doesn't follow, you'll turn the adjuster counter clockwise. However, newer derailleur systems like Shimano's Shadow series or Sram's derailleurs, you'll notice that there is no barrel adjuster at the derailleur end! So... you'll have to use the barrel adjuster at the shifter end. Good Luck!

Aug 03, 2013 | Cycling

1 Answer

How to adjust front derallier on fuji 18 speed


You will need to raise the back wheel to perform these adjustments... so that you can activate the pedals and oberve closely the functioning, as you adjust....

On the tube mounting: The derailleur needs to just clear the teeth of the front chain wheels, as it moves from one to the other. It needs to be square with the chain wheels.

The other adjustments are limiting in nature. You need the derailleur to not move the chain off of the outside of either front chain wheel. as you get closer, move the rear derailleur to extremes and then shift the front derailleur, slow and fast..... Limit is correct when you can move the derailleur so as to not ride on the chain, but not throw the chain off the wheels.

Sometimes, guys turn the front derailleur, slightly so that the last portion of the derailleur body gives the chain a little boost to the bigger gear...This is just a very small amount. Sometimes it just works better that way.

Nov 22, 2010 | Shimano 24 Speed Road Racing Bike Bicycle...

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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

Chain coming off fron gear when coasting or trying to pedal backwards? Local bike repair shop indicated that a bearing maybe shot but that they couldn't replace the front gear unit.


Oh, it is too bad you are in the Bronx. i'd have that fixed right quick. There are probably a pair of culprits at work here. One, your derailleurs no doubt need adjustment. Two, your rear derailleur hanger may be bent. These two can both cause the problem. Start with the rear hanger, because that will be easier to see.
Flip the bike onto the bars and saddle and take a look at your rear derailleur. Is it going straight up and down and is it aiming straight with your frame? If it isn't, you have found your problem. The hanger needs to be straightened. This can be done without any tools if you have a good eye. Hold the derailleur by the body and bend it to make the alignment good with the cassette. If this is NOT the problem (but i really think it is) then here is a walk-through on adjusting your derailleurs and hopefully this will solve it.
Here is how to adjust the rear (first):
-Set your front gear to its middle position.
-Shift the rear into the highest gear.
-Disconnect the derailleur cable.
-Screw the barrel adjuster on the shifter (or down tube if it is a road bike) to fully turned in clockwise.
Screw the barrel adjuster on the rear derailleur to its halfway point.
-On the back of the rear derailleur you will see two screws. One will be marked "H" and the other "L". These mean high and low. Adjust high to get your jockey wheel on your derailleur perfectly centered over the smallest cog on the cassette. Manually shift by pushing the derailleur (while cranking the pedals) to the largest cog (1st gear) and set this stop on the derailleur "L" where the jockey wheel is over the cog, but past it where it would be touching the outside of the cog if they were side-by-side.
-Pull the derailleur cable taut and re-tighten it.
Shift the rear to the middle gear and adjust the derailleur using the barrel adjuster to center the jockey wheel directly over the cog it should be.
-Now shift up and down the cassette, cranking as you go and in every gear, back-pedal to make sure there is no problem with the gears hopping. If they do, adjust as necessary with the barrel adjuster.
Here are some tips for the front:
-Shift into low gear on the front and rear derailleurs. Make sure the chain is not rubbing on the front derailleur. If it is, adjust the screw marked "L" until the chain just clears the derailleur but does not touch it.
-Pull the derailleur cable taut and re-tighten it.
-Now shift the front into the middle gear and while it is still in the low gear in the back, crank to make sure the chain is not rubbing on the front derailleur. If it does, adjust the tension of the cable with its barrel adjuster.
-Shift the front into high gear and shift the rear to the highest gear, cranking as you shift. If the chain is not rubbing, you are all set.

Sep 16, 2009 | Cycling

1 Answer

I'm trying to adjust the shimano gearing on my trek bike and am having a little trouble


Front or rear? What is it doing?
Flip the bike over onto the handlebars and saddle and let us fix it.
Here is how to adjust the rear (first):
-Set your front gear to its middle position.
-Shift the rear into the highest gear.
-Disconnect the derailleur cable.
-Screw the barrel adjuster on the shifter (or down tube if it is a road bike) to fully turned in clockwise.
Screw the barrel adjuster on the rear derailleur to its halfway point.
-On the back of the rear derailleur you will see two screws. One will be marked "H" and the other "L". These mean high and low. Adjust high to get your jockey wheel on your derailleur perfectly centered over the smallest cog on the cassette. Manually shift by pushing the derailleur (while cranking the pedals) to the largest cog (1st gear) and set this stop on the derailleur "L" where the jockey wheel is over the cog, but past it where it would be touching the outside of the cog if they were side-by-side.
-Pull the derailleur cable taut and re-tighten it.
Shift the rear to the middle gear and adjust the derailleur using the barrel adjuster to center the jockey wheel directly over the cog it should be.
-Now shift up and down the cassette, cranking as you go and in every gear, back-pedal to make sure there is no problem with the gears hopping. If they do, adjust as necessary with the barrel adjuster.
Here are some tips for the front:
-Shift into low gear on the front and rear derailleurs. Make sure the chain is not rubbing on the front derailleur. If it is, adjust the screw marked "L" until the chain just clears the derailleur but does not touch it.
-Pull the derailleur cable taut and re-tighten it.
-Now shift the front into the middle gear and while it is still in the low gear in the back, crank to make sure the chain is not rubbing on the front derailleur. If it does, adjust the tension of the cable with its barrel adjuster.
-Shift the front into high gear and shift the rear to the highest gear, cranking as you shift. If the chain is not rubbing, you are all set.

Sep 02, 2009 | Cycling

1 Answer

Adjusting front derailer


Typically adjusting the front derailleur is a matter of adjusting the two adjusting screws on the derailleur. So turn the bike upside down. It should sit on its seat and handle bars. Find the two adjusting screws one will prevent the derailleur from traveling too far out preventing the chain from coming off. The other screw prevents the derailleur from traveling too far in keeping the chain from falling off that way. Now once you have found the screws slowly start turning the pedals like it was being ridden. Move the derailleur out as far as it will go if you see the chain is about to come off adjust the screw. Do same for inside screw. Now move the back derailleur all the way in and retest front derailleur, repeater with rear derailleur all the was out. Hope that helps. Oh, the back derailleur adjusts same way.

Feb 27, 2009 | Shimano Brake Cables Atb Mountain Bike...

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