Introduction
This guide shows how to fix a stiff chain link on a bicycle drivetrain.
A bicycle chain moves power from the pedals to the rear wheel, ultimately allowing the bike to move forward. Each chain consists of many small links that must bend freely as the chain progresses through gears. Sometimes one link can become stuck or stiff, most commonly due to dirt buildup or lack of lubrication, which prevents it from bending smoothly. This can cause the chain to jump, skip, or make a clicking noise while pedaling.
This guide is intended to help you identify a stiff chain link and repair its movement through the application of lubricant and flexing the link until it moves freely again. By fixing a stiff link, it helps improve gear shifting and helps the chain move smoothly though the gears.
Common symptoms of a stiff chain link include:
- A clicking sound when the chain passes through the drivetrain
- A visible chain link that does not bend like the others
- Uneven pedaling when riding.
Before you start the repair, confirm that your bicycle is stable so the rear wheel can move safely when operated. Avoid placing your fingers between the chain and gears while rotating the pedals to prevent injury.
What you need
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Shift the bicycle into a middle rear gear (about halfway across the cassette) to reduce chain tension.
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To do this, slowly rotate the pedals forward while your right hand is positioned on the gear shifter. As the pedals are moving forward, use your right hand to shift to the middle gear.
Ask FixBot
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Place the bicycle in a stable position where the rear wheel can move freely. A repair stand is ideal, but if one is not available, the bicycle can be carefully flipped upside down so it rests on the seat and handlebars.
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Slowly rotate the pedals backwards (counter-clockwise) while watching the chain move through the rear derailleur pulleys (small wheels under the gears).
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Identify the stiff link by watching for a section of chain that does not bend smoothly around the pulley wheels.
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Stop rotating the pedals when the stiff link is positioned between the derailleur pulleys for easy access.
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Wiggle the chain from side-to-side at the stiff link to loosen it slightly. Bend it a little toward the bicycle frame and then a little outwards of the bicycle frame and repeat. This motion helps loosen the tight joint that is preventing the link from bending smoothly.
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Apply one small drop of bicycle chain lubricant directly onto the stiff link. Avoid over-lubricating.
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If the link remains stiff, use a chain tool to very slightly adjust the chain pin.
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Position the stiff link inside the chain tool so that the tool's medal pins line up with the stiff link on both sides. Slowly turn the handle clockwise (no more than 1/8 of a turn).
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Flex the chain link back and forth repeatedly until it moves freely like the surrounding links.
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Rotate pedals again to confirm the stiff link moves smoothly through the derailleur.
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Carefully test ride the bicycle to confirm it is smoothly pedaling and shifting.
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York University, Team M-3, Woodhouse Winter 2026 Member of York University, Team M-3, Woodhouse Winter 2026
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