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What are derailleurs? - Cycling

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A bicycle mechanism that moves the chain out and up, allowing it to shift to different cogs..
http://racingfuture.com/

Posted on Apr 15, 2013

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The derailleur is responsible for changing the gears by moving the chain from one sprocket to another. Bicycles usually have 2 derailleurs: Front and rear. When bikes are faster (on the higher ratio) the chain is located in the biggest sprocket in the front and the smallest in the back. When the bike goes slow it means that the chain is located on the smallest sprocket in front and on the biggest in the back.

Posted on Jan 17, 2013

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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

2 Answers

Rear derailluer bolt missing how and where do i reattach it?


Depends on which bolt is missing and what derailleur your referencing.

If you no longer have the bolt then I would suggest taking the bike or derailleur into a bike shop and have them provide the proper bolt to complete your derailleur. They can also advise for your specific derailleur how to reattach. Not all derailleurs work the same.

Apr 07, 2011 | Cycling

1 Answer

I am trying to fix a Huffy Blackwater bicycle (15 speed). The rear derailleur is missing. Can I use a 6 speed derailleur from a Next bike? Can I disable the indexing of the Huffy (Falcon) shifter? Thanks


You can use the 6 speed rear derailleur with no problems. The 5-spd shifter does not need to be disabled, as it will work just fine.

The shifter controls the rear derailleur, telling it how far to move. The rear derailluer just follows what is dictated, so there is no real difference mechanically between the 5spd and 6spd derailleurs, only in the shifter.

If you wanted to make the bike 6spd, you would have to change the shifter and gears along with the derailleur.

Dec 21, 2010 | Huffy Blackwater Men's 26-Inch Mountain...

1 Answer

My sram x-7 derailleur hanger broke and i bent the derailleur. I've replaced the hanger and re alligned the derailleur but i went to bolt the derailleur back onto the hanger but the bolt doesnt seem to be...


You need to replace the main pivot bolt, something (most likely a tab) is broken. This one is best taken to your local bike shop for inspection. There may be something your missing like a crack in the body or another broken part. Link to Manual.

You can also contact the SRAM customer service for support, but they will refer you to a shop to take care of the problem and order any parts on this type of problem.

Dec 14, 2010 | Sram X7 Mountain Bike Rear Derailleur

1 Answer

Need pulleys for my TD One derailleur


There are no pulleys on the front derailleur. Only the Rear derailleur has pulleys.

The Front derailleur consists of two plates that work the front gears (chainrings)

The Rear derailleur consists of a long arm with 2 pulleys to wrap the chain while shifting the rear gears (cassette).

Pulleys range from $10- a pair to $75-. Your local bike shop should have a suitable replacement set of pulleys, depending on the model of your derailleur it is sometimes less expensive to just replace the whole unit.

Dec 09, 2010 | Mountain Td-one Bicycle Front Derailleur...

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

Top derailleur not returning to first position


There are several possible problems with your deraileur. The first and most common reason for your derailleur not shiftering back down to the small chainring is a result of a cable and/or housing becoming contaminated or damaged. First check that the cable is not hanging up on something. Next look for any damage to the cable or housing starting at the shifter and working your way back to the derailleur. If the cable/housing is not damaged check to see if it looks rusted or just plan dirty. If any of the above is true it is recommended that you replace the cables or housing. If it is only slightly rusted or dirty looking you can try lubing the cables/housing with something like Tri-Flow. This may get the cable moving again take care of the derailleur problem.
The next most common problem is the result of the derailleur itself needing to be lubed because it is contaminated. It is best to spray the derailleur with GT-85 and work the derailleur back and forth manually until it is moving freely. Make sure you have the shifter shifter into 1st gear so it can move when you begin working on it.

These are the two most commong problems with a front derailleur not shifting back down unless the derailleur has been damaged in a crash or adjusted incorrectly. I gather that the derailleur was working and then it stopped so it is not the result of damage or incorrect adjustment.

If you need any more advise or help with the cable installation process you can contact me at elijah@starbikesfl.com.

Hope this helps. Thank you

Jul 15, 2009 | Shimano Deore LX Mountain Bike Front...

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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