Over time, your bike’s chain can become elongated because of wear, which causes the bushings’ inner diameter to increase and the pins to groove out.
An elongated chain will often sag and not fit into the cassette cogs and teeth properly, thus slipping off, especially when there is a gear change.
Furthermore, a stretched chain transfers less power when you peddle; hence, you can’t move forward as fast as you wish.
The best and easiest way to know your bike’s chain is stretched or elongated and needs fixing is if you pedal hard and it comes off.
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