"Replacing the chain at the right time can help extend the life of your expensive cassette and chainrings and also improve shifting performance for your drivetrain. Sure, bad shifting can be the result of a poorly set-up derailleur, stretched cable, or a cooked cassette, but most likely it's your worn bike chain that is causing the missed shifts and noise."
"Chains are a consumable part of a drivetrain, which means that they wear out over time as you ride. Things start to fall apart, and these small internal components, like rivets and rollers, degrade, causing what is referred to as "chain stretch." Chain stretching causes poor engagement between the cassette cogs and the chainrings, leading to poor shifting and accelerated drivetrain wear."
"There will be noticeable symptoms of chain wear, such as chain slipping under load and chain suck, leading to binding when back-pedalling. You might also notice that shifting on the smaller cogs of the cassette is sloppy, and the chain struggles to climb up the cassette block. This is especially noticeable on modern 12-speed drivetrains that use thinner chains."
Chains wear as internal parts like rivets and rollers degrade, creating 'chain stretch' that reduces engagement with cassette cogs and chainrings. Worn chains cause slipping under load, chain suck, noisy or sloppy shifting, and faster wear of expensive cassettes. Modern 12-speed drivetrains are particularly sensitive due to thinner chains. Checking chain condition can be done by lifting the chain from the front chainring to measure rivet spacing or, more accurately, by using a chain wear indicator tool. Regular cleaning, lubrication, and timely replacement prevent drivetrain damage and maintain reliable shifting performance.
Read at BikeMag
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