Tern PEDELEC Manuel D'utilisateur page 31

Chain Tension
Excessive slack can be caused by a Chain that is worn and stretched. A stretched Chain will not sit properly in the teeth. Over time, gaps
between the teeth of the Sprockets becomes greater, mirroring the shape of the Chain. Replacing a Chain when it is worn will help extend
the life of the most expensive Cassette and Chainring.
For internal gear hubs, excessive slack can also be due to misadjustment of the rear wheel position relative to the dropout.
If you are not sure if the chain slack is from chain wear or wheel misadjustment, take your bike to the dealer for servicing.
Cleaning
When your Tern needs cleaning, use a bucket of water and gently sponge off any accumulated dirt and salt from your bike. Dry your Tern
after cleaning to prevent rusting.
Do not clean your Tern using a pressurized spray or steam because water can be forced into sealed areas and damage your bike.
The chain endures huge tension forces from pedaling. For optimal shifting
and efficiency, the Chain must connect with the teeth properly.
To check for excessive slack, shift to the smallest gear on the Cassette (if
applicable) to create the greatest amount of slack in the Chain. Chain slack
should be within 10-20 mm per span. This amount of slack is equally
applicable to all internal hub gear chain drives.
Note: Belt drive tension is more complicated and should be serviced by
dealers.
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