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This tool also has a lockring spanner for securing a reverse threaded lockring against the sprocket. Bottom bracket wrench for newer bottom bracket styles Crank extractor. A chain tool or chain splitter is used to 'break' a chain, in order to remove it from a bike or remove links, or to put a chain back together.
This becomes a problem when the freewheel needs to be removed. Having undergone high torque from leg muscles, it is difficult to loosen and remove the freewheels. A freehub, on the other hand, has cogs that slide onto an axially-splined cylindrical outer shell. A lockring or the last cog(s) are threaded onto the freehub.
Automatic free wheeling hub of a 1986 Mitsubishi Pajero Mechanically (manually) activated free wheeling hub on a Toyota Land Cruiser J60 from the 1980s, with marked turning positions free and lock
Generally, the freewheel is selected to be the same size, or slightly larger (more teeth) than the fixed cog. The same size allows the same gearing, but with coasting option, while a slightly larger freewheel gear allows coasting and easier pedaling for longer or hilly rides. Both could also be freewheels for two different coasting gear selections.
The rotafix enables the securing of a sprocket ("cog") to a track hub without the use of a chain whip.. The chain is removed from the chainring and rests around the bottom bracket shell and on the sprocket with the rear wheel in the horizontal track ends.
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Cluster: a bicycle cogset, either a freewheel, or cassette; Cogset: the set of rear sprockets that attaches to the hub on the rear wheel; Cone: holds bearings in place, pressed against the cup; Cotter: pin for attaching cottered cranks; Coupler: to connect tubing together; Crankset or chainset: composed of cranks and at least one chainring