Follow the same steps as the rear, but on the front, and you will quickly find if this is the issue, and allow you to be able to adjust it as needed.
Whenever you change out your chain, make sure to line it perfectly up to your old chain and remove or add links as necessary. You will need to get yourself a too like this chain splitter to do this correctly!
Its a tool that is indispensable when maintaining your bike. Like anything that is used regularly, sometimes parts just get worn out. They may not be damaged from being bent, or hit hard, but it may just be time to replace components.
Teeth on your crankset or chainring may be starting to wear, allowing the chain to slip off without meaning to. Bikes require maintenance just like cars, and you should check these things regularly to see if it is time to start replacing components. I think this is something most people run into! Your bike is running fine, and probably has happened to everyone at least once. This will cause the derrailleur to incorrectly extend itself a little too far, and cause the chain to fall off.
Of course, there are many other reasons that a chain can come off like a dirty or even weathered drivetrain, bent components and more. However these are all great places to check first! Keeping your bike in tip-top shape is important, and I hope you enjoy your bike more and more every day! Table of Contents. How does a chain work? Before you start 1. Something is loose 2.
Try backing off your effort but still pedaling when shifting between chainrings. Another way to keep the chain from coming off the inside of the chainset is to use a chain catcher. A chain catcher is essentially an arm that acts as a barrier to the chain overshifting inwards.
If the chain is coming off the inside of the cassette, put the chain onto the smaller chainring at the front and the largest sprocket at the rear. Then turn the L screw clockwise until you see the rear derailleur cage the section that hangs down start to move away from the centre of the bike. You need to move it to the point where the chain can move freely into the largest sprocket, but can go no further than that.
If your chain is coming off the outside of the cassette, put the chain onto the larger chainring and the smallest rear sprocket. Then turn the H screw clockwise until you see the rear derailleur cage start to move towards the centre of the bike. You need to move it to the point where the chain can move freely into the smallest sprocket, but can go no further than that.
In most cases, the rear derailleur pulleys should be lined up directly underneath one another. If you do all this and your chain is still coming off, there are several other things to look at:.
Check that it is positioned correctly by taking a look at our article on how to index front gears. Shifting performance can start to become less smooth and more erratic as components near the end of their useful lives.
Again, a visual check will tell you what you need to know. Pull the two ends together and add one complete link one inner and one outer half link to get the correct chain length. There are other reasons why your chain could come off, but we think these are the main ones.
If you like road. As a subscriber you can read road. The revenue from adverts helps to fund our site. Your subscription will help us to do more. Mat has been road. Carefully watch for a link that jumps and clicks as it passes over the jockey wheel.
Gloves are recommended for this approach. Did you chain drop when you were riding cross-chained? Doing so creates an excessively slanted chain angle that stresses the hardware and causes chain rub, eventually leading to a dropped chain. The good news is the fixing this issue only requires you to be more cognizant of your gear usage during rides.
Rather than using the extremes of your gears, stick to more intermediate combinations to prevent excessive chain angle and give yourself more options for shifting up or down. Did you just replace your chain? Are you sure that the new one is the right size? Because the old one will have stretched, your new one should be a little bit shorter. If the chain is too long and has too much slack, you will probably need to remove a couple of links to obtain the proper length.
A chain that is at the proper length should be able to reach the large-large gear combination, and not have the rear derailleur overlapping itself when in the small-small gear combination. Derailleur bike chains are designed to allow the chain to transition from one sprocket to the other during shifts.
As the number of gears in the cassette increases i. To allow for proper shifting, chains follow this trend and also get narrower to accommodate the narrower spacing. While most cases are nowhere near as severe as the one pictured here, a bent chainring or even chainring tooth can be your source of dropped chains.
Accidents are the most common cause, however, a bike that simply topples and strikes a hard surface could be enough to bend a chainring tooth. Inspect the chainring by backpedaling and seeing the distance between the chainring and frame changes.
If you feel a sudden change in resistance pushing back against your hand it means that the ring is bent. Badly bent chainrings will have a very apparent wobble to them while turning.
You can try to use a wrench to gently bend the chainring back into place, or they also make specialized chainring straightener tools as well. Not only can poor alignment of the rear derailleur lead to noisy shifts, but it can also lead to chain drops in severe cases of misalignment.
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