On Bicycles
The term is also used to refer to the device often used on tandem bicycles with timing chains, single-speed bicycles with a rear disc brake or an internal-geared hub, or any bicycle with vertical dropouts and no derailleur, to allow slight repositioning, fore and aft, of a bottom bracket in order to properly tension the chain.
They may be held in place by a built-in wedge, set screws threaded into the bottom bracket shell, or pinch bolts that tighten a split bottom bracket shell.As a standard sized bottom bracket threads into the eccentric, an oversized bottom bracket shell is required to accommodate the eccentric.
Read more about this topic: Eccentric (mechanism)
Famous quotes containing the word bicycles:
“Holland is a dream, Monsieur, a dream of gold and smoke—smokier by day, more gilded by night. And night and day that dream is peopled with Lohengrins like these, dreamily riding their black bicycles with high handle-bars, funereal swans constantly drifting throughout the whole country, around the seas, along the canals.”
—Albert Camus (1913–1960)