Dating campagnolo parts

Low normal or rapid rise rear derailleurs return the chain to the largest sprocket on the cassette when no cable tension is applied.

Sometimes the rear-derailleurs are re-purposed as chain tensioners for single-speed bicycles that cannot adjust chain tension by a different method.There may be one or more adjustment screws that control the amount of lateral travel allowed and the spring tension. High normal or top normal rear derailleurs return the chain to the smallest sprocket on the cassette when no cable tension is applied.The components may be constructed of aluminium alloy, steel, plastic, or carbon fibre composite. This is the regular pattern used on most Shimano mountain, all Shimano road, and all SRAM and Campagnolo derailleurs.However, these systems, along with the rod-operated Campagnolo Cambio Corsa were eventually superseded by parallelogram derailleurs.In 1937, the derailleur system was introduced to the Tour de France, allowing riders to change gears without having to remove wheels.Previously, riders would have to dismount in order to change their wheel from downhill to uphill mode.

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