The FLUX Smart is the most silent flywheel driven trainer available on the market. However in some cases, the trainer may generate a noise that is out of the ordinary. Please see below for a list of known sounds.
In some cases a cracking sound is coming from the bike trainer, but only occurs while cycling. Please see below for two possible reasons causing these sounds.
Greasing of freehub body:
This can easily be solved with a with little maintenance. Please go to "Maintenance & care" for instructions on how to grease your FLUX Smart.
In some cases the cracking sound is caused by the cassette that is assembled too loosely. Please make sure the cassette is assembled tight enough, by tightening the lock ring.
Note: In case your bike trainer is causing a sound that isn't listed above and you are concerned it is a sound that is out of the ordinary, please contact Tacx support