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Boss
From WikiPedalia
A bump or protrusion. This term has several specific bicycle usages:
- Cantilever bosses are the brazed-on pivots attached to frames and forks for cantilever brakes.
- Shift lever bosses are brazed-on pivots for down-tube-mounted shift levers. Most newer "road" bicycles have the shifters mounted on the handlebars, so they use the old-style lever bosses as attachment points for housing stops
- Older style freewheel pullers had two (or four) protruding bosses that engaged the notches of the freewheel body. This system was prone to failure when removing freewheels that were unusually tight. The development of splined freewheel removal systems made this obsolete
