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Slipped bike chains may be caused by several different problems including poor shifting technique, the chain being too long, or a worn out chain or rear casters.
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Before getting off the bike, downshift bike into lowest front gear (using the left shifter).
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Continue pedaling. This step alone may realign the chain.
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If Step 1 did not work, get off the bike and lift the rear tire while spinning the pedals with your hand.
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If Step 2 is not enough, push rear derailleur forward to release tension on the chain.
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Lift the chain and put it back on the chain ring.
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Turn the pedals with your hand while lifting the rear wheel to realign the chain (as in Step 2).
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Put the chain on the outer chain guide of the chain breaker.
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Turn the handle on the chain breaker to push the chain pin part of the way out.
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Remove the chain breaker by backing up the drive pin.
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Pull the chain apart.
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Repeat Steps 4-5 to remove a link:
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Feed the chain along the guide pulley (the highest of the two pulleys).
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Thread the chain inside the derailleur cage in between the tension and guide pulley.
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Thread the chain in front of the tab.
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Then, thread the chain over the tension pulley.
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To rejoin the chain, align the open ends of the chain.
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Put the chain on the outer guide of the chain breaker with the pin facing the driving pin.
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Turn the driving pin until the pin is equally spaced in between the face plates like all of the other links.
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Wiggle the link you just reattached. If it's too stiff, continue on to the next part.
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Put the chain on the inside guide of the chain breaker and turn the driving pin just a little. Check as you go along and continue until proper looseness is achieved.
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If your chain continues to slip, the chain or cogs are probably worn out. Have a local mechanic look at your bike and determine which needs to be replaced. If it's the chain, visit this guide <Triace A310 Chain Replacement>
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Cal Poly, Team 23-3, Green Winter 2015 crwdns2935289:0Cal Poly, Team 23-3, Green Winter 2015crwdne2935289:0
CPSU-GREEN-W15S23G3
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A guide to indicators if cogs are worn would have also been helpful. Many of us ride a bike due to financial constraints, employing local mechanic may not be possible (I certainly can't afford that). A brilliant guide otherwise, thank you.
evocrim - crwdns2934203:0crwdne2934203:0 crwdns2950251:0crwdne2950251:0
Thanks for the information. How do I know how long the new chain should be. Hint, don't have broken one.
Kenneth Silvestri - crwdns2934203:0crwdne2934203:0 crwdns2950251:0crwdne2950251:0
I have a chain guide on my bike only now that the chain is off, I can’t seem to lift the chain onto the top of the chain ring as the guide is blocking this.
judith brough - crwdns2934203:0crwdne2934203:0 crwdns2950251:0crwdne2950251:0
I need help fixing the ring of my mountain bike please
N/A - crwdns2934203:0crwdne2934203:0 crwdns2950251:0crwdne2950251:0
Poor chain condition is one of the most common causes of a bike chain slipping when pedaling hard. An old chain has stretched out from use leading to its dropping and you will need to be replaced a new one.
Dalton - crwdns2934203:0crwdne2934203:0 crwdns2950251:0crwdne2950251:0
