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This article will help determine whether your bike has a cassette or freewheel system, and what tool is needed to remove and install the rear cogs.
This article will review the removal and installation of cassette cogs on derailleur-type bicycles. The threaded freewheel system is discussed at Freewheel Removal and Installation.
This article will review the removal and installation of threaded freewheel systems as well as single speed freewheeling BMX/Freestyle bikes. Cassette cog systems are discussed at Cassette Removal and Installation.
This article will discuss removing freewheels that have no removal tool option. This will be useful if the wheel is to be reused, but it will effectively destroy the freewheel. For wheels that are damaged with these types of freewheels, it is best to simply replace both the complete wheel and freewheel.
This article will discuss freehub service for the following brands: Shimano®, DT-Hugi® (some Bontrager), American Classic®, Campagnolo®, Bontrager®, Cane Creek®, and Zipp®.
This article with discuss the concept of chainline. See also related article on frame alignment.