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To tighten a loose chain on a hub- or fixed-gear bike, first use a wrench to loosen the axle nuts on the rear wheel. The chainring, or a chainring tooth, could be bent. A chain that keeps falling off is either too loose (in the case of a hub-gear or fixed-gear bike), or the derailleurs are badly adjusted and move the chain right off the cogs when you change gears.A visual inspection while turning the cranks should reveal if there’s a problem here. Derailleur tension plays a huge role in holding the chain properly on the bigger cassette chainrings. It might be that the chain is worn, has a stiff or bent link, or has become clogged up with dirt.Is your drivetrain worn and in need of replacement? Shifting performance can start to become less smooth and more erratic as components near the end of their useful lives.
Bike chain too long how to#
Check that it is positioned correctly by taking a look at our article on how to index front gears. If the twelfth pin is more than 1 16 inch (0.16 cm) off the 1 foot (0.30 m) mark, you need a new chain. The pins are the small circles in the middle of the links when you look at the chain from the side. Your front derailleur could have moved. The cardinal rule for long chain life is never to lubricate a dirty chain, as this washes abrasive particles into the rollers. To check the chain, use a ruler to measure a 12 in (30 cm) distance between 24 pins in the chain.If you do all this and your chain is still coming off, there are several other things to look at: If the chain is too tight, the drivetrain will bind, perhaps only at one. >Read more: How to adjust and tune indexed rear derailleurs What if your chain is still coming off? With standard, long-slot track dropouts and axle nuts, you tension your chain. If it is stop adjustment the chain will go into the spokes over the big sprocket when he is pedalling, not when freewheeling. In most cases, the rear derailleur pulleys should be lined up directly underneath one another. The usual cause is a stiff freehub or too long a chain. Before you do anything, check that the rear wheel is sitting correctly in the dropouts with the rim running centrally in the chainstays, and make sure that the rear derailleur and its hanger (the piece to which the rear derailleur is bolted) aren’t bent. Again, though, if the chain wasn’t coming off before but has recently developed the habit, the setup has somehow changed.