![Sportcraft A-bike User Manual Download Page 23](http://html1.mh-extra.com/html/sportcraft/a-bike/a-bike_user-manual_1349755023.webp)
Adjusting chain tension
The A-bike chain tension is preset in the manufacturing process.
If the chain needs to be replaced it should be referred to a bicycle
mechanic or an A-bike dealer.
If the chain is too slack it may be noisy and if too tight it may make
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some slack.
The A-bike has a two-chain drive system. Put the unfolded bike
upside down on a clean surface. One chain can be obviously
viewed, cleaned and lubricated through the gap in the crank casing
where the wheel is. The other chain can be lubricated through a
small inspection hole in the centre of the crank casing.
High chain tension
Low chain tension
Medium chain tension
Bearing Holder
To adjust chain tension, unscrew and then rotate the Bearing Holder
and the opposite one at the same time.
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Adjusting chain tension