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Foam
To prevent internal cables from rattling, they should be laid in foam sleeves. These sleeves are available from Capgo, for example. Two metres of them weigh just three grams.
Bottle brush
If you want to ensure peace and quiet for your internal cables later on, fix them in place with a twisted bottle brush. They can also be pushed through the head tube or bottom bracket into the down tube if the cables are already fitted.
Slapper Tape
The self-adhesive tape made of profiled elastomer is not only the perfect solution to prevent paint damage to the rear triangle, but also dampens chain slap on rough terrain.
Shut the fuck up
Downhill legend Chris Kovarik has invented a new part to prevent chain slap. The two rings of the STFU guide are designed to reliably tame and immobilise the chain.
Self-sealing tape
Alternative to cable ties: self-sealing repair tape from the DIY store. It fixes the cables permanently and rattle-free.
Line clips
With the swivelling S-hooks (e.g. from Jagwire), individual cable segments can be clipped together. This prevents noise and also looks neat and tidy.
Freewheel body
Too little grease on the freehub body is a common cause of cracking and creaking noises when pedalling. So remove the cassette, clean the freehub body and apply plenty of thick grease.
Chainring
Sometimes the fit of the chainring on the crank also causes noise. The same applies here: first clean thoroughly and then coat with assembly grease.
You can find this article in BIKE 1/2020. You can read the entire digital edition in the BIKE app (iTunes and Google Play) or the print edition in the DK shop reorder - while stocks last:

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