Lifespan of a drive train
When buying a bike, it's important to take into account the cost of servicing it, especially as regards the drive train.
The amounts below are averages and are given so that you have a general idea of what to expect. They will of course vary depending on the care you take of your drive train.
The average lifespan of a well-maintained chain is 5000 km.
The average lifespan of a cassette is 10,000-12,000 km.
A poorly maintained chain can jump, which can damage your bike's frame.