Why do you want to lubricate the cassette? It has no moving parts. You lubricate the chain to reduce its internal friction as it moves over the teeth of the gears. You lubricate the bearings or bushings of the derailleur pulleys to reduce their internal friction, and the deraillleur pivots so that the gear changes remain smooth. What purpose would lubricating the cassette serve, other than to cause the cogs to get dirty at a faster rate? If you mean lubing the freehub assembly, that is a different story, and there are many theories about wether or not you shuld introduce any lubricants into the rachet mechnism or not, and which lubricants you should use, etc. If you do decide that it is a good idea, wax based lubes would be a last resort, sinc ethe fact that they solidify would hamper the normal operation of the freehub mechanism.

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