1. Transmission Chains
Sprockets The basic sizes of the sprockets (front and rear) are common to all manufac- turers; however, the tooth shape is different. This is especially true for the sprockets for 1/2 3 3/32 chains. Each manufacturer designs its own tooth shapes for better shifting. Exercise care when changing sprockets. Selection and Handling (1) Manufacturers usually offer a selection system for derailleur transmission, which includes the chain and sprockets. Check the manufacturer’s catalog for information. (2) The chain’s performance is usually influenced by wear. Select a chain with specially coated pins, which increase wear resistance. (3) You must connect the chains carefully, or they may break during operation. Use special connecting pins (sold separately) to connect chains, especially those used with derailleurs. (4) These chains are frequently exposed to rain, dirt, or mud, which can lead to elongation or rust. The chains need regular cleaning and lubrication. (5) Do not use weak-acid rust remover (such as phosphatic rust remover) on these chains. These chemicals can cause hydrogen embrittlement and chain breakage. Technical Trend To keep up with the design enhancements of bicycles, chains are being developed in several ways: (1) Lighter weight. (2) Higher rust and weather resistance.
(3) Attractive appearance. (4) Nonstaining to clothes. (5) Lower noise at engagement.
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