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How do I adjust the gears to stop the chain coming off and the gears slipping?

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The chain starts to spin but slows to a stop and revs as if it's in neutral.


You haven't stated the make and model, so its hard to answer your question precisely. Check the drive gear off the motor that's driving the chain to make sure nothing had come loose or worn meaning its spinning but slipping on the drive.

Apr 18, 2016 | Garden

1 Answer

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

How to keep my gears from slipping


Firstly ensure the derailleur is in good condition and not bent so the chain is running perfectly in line with the sprockets. Ensure the stop screws limiting the extent of the travel of the derailleur are set correctly to prevent travel beyond the first and last sprocket.

A badly worn chain could need shortening or replacing in order to provide the correct chain tension or a loose chain could be a matter of a derailleur that hasn't seen the oil can for a while and is not tensioning the chain correctly.
If the bike has been involved in an accident the rear forks could perhaps need some adjustment so a straight edge laid alongside the main chain-wheel coincides approximately with the middle of the rear sprocket cluster.

At this stage it is also wise to ensure the gear cable is in A1 condition, smooth operating and properly oiled with no internal frayed strands causing problems.

If your gear selectors are of the modern style with detents the gear cable needs adjusting so the centre of each detent at the gear selector positions the derailleur precisely below the selected sprocket. Once this is done if everything else mentioned above is ok the gears should now operate smoothly and positively.

If adjustment doesn't work then the problem is likely to be with the basic requirements above.
Good luck!

Jan 26, 2015 | Cycling

2 Answers

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

Hi, the crank slips around as you are peddling, how can I fix it? Thanks


Evaluate what is really happening. The chain has to engage in the teeth both front and rear or it will seem to slip.

If your drive train is original, high-mileage and/or under-maintained you probably have worn gears and a 'stretched' chain.

http://sheldonbrown.com/chains.html

http://bicycletutor.com/chain-wear/


Total replacement is the only way to resolve worn

Incorrect rear derailleur adjustment will allow unintentional shifting between adjacent gears which sometimes feels like skipping.

http://www.parktool.com/blog/repair-help/rear-derailler-adjustments-derailleur

Apr 09, 2011 | Cycling

1 Answer

How do I adjust the gears, which have been slipping?


If you mean that your gears are slipping by means of the chain improperly engaging or riding along the walls of the cassettes outer gears, you can adjust the rear derailleur by means of a few tools. You can control how far in and out the derailleur moves by adjusting the two limit screws with either a proper fitting allen wrench or a small phillips head screwdriver. This won't have any affect on the inside gears but if it slips on the outer-most gear, it may help. You can then adjust the cable pull by hand on the adjusting knarp if present on the derailleur. It is the little (sometimes plastic shrouded) adjusting mechanism which the cable housing seats itself in. It is found directly on the derailleur and commonly on the shifter being used with the derailleur. You can rotate the knarp clockwise to loosen the cable or counter-clockwise to tighten. If the knarp has been threaded all the way in or too far out, you can return it to its original position and tighten or loosen the shifter cable manually using either a 5mm allen wrench, a 9mm box end wrench, or a specialty tool. Depending on the positioning of the derailleur and its design, tightening or loosening the cable will affect the position at which it is placed for each related gear. With a little bit of time and examining, you can hopefully figure out the most effective setting which would hopefully allow the derailleur to engage each individual gear without hesitation. To tell wether you adjusted it properly, follow these guidelines. 1, Make sure each gear being engaged is reflected on the position of the shifter. 2, When shifting gears by hand, the chain should not drop below the selected gear nor should it hesitate to move into the selected gear from its previous gear. 3, Check the limit screws position on the derailleur and make sure it is adjusted so your low and high gears are engaged without the chain slipping past the low or high gear, and slipping of the cassette. 4, When tuning the rear derailleur, make sure you account for the change in the chains travel path due to front chainwheel shifts.

- If the derailleur is not an issue, and you attempted to adjust it with similar results afterwards, look over the drivetrain of the bike closely while it is in motion and try to see the exact component that seems to be the source of the problem. I will be happy to dig deeper into this problem if you wish to ask another question regarding this issue. Good luck.

Mar 03, 2011 | Dahon Speed D7

1 Answer

Chain is slipping and jumping gears


okay lets ask why it broke did it get jammed?was it worn?is your front crankset or rear gearset loose with play in it?does the chain make a clicking while pedalling hard? first and last require a replacement chain because it broke for a reason.if your drive gears are loose then you will have to adjust/repair them also checking adjustment on the derailuers should be checked.
hope this helps

Jul 13, 2010 | Mongoose Cycling

1 Answer

Chain slipping after changing tire


You may have knocked the gear derailleur when fixing and re-fitting the rear wheel. This can knock the derailleur out of whack slightly and will need proper adjusting by your local bike shop.

Jun 02, 2010 | Schwinn Windwood 26 Women s Cruiser...

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