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The front
derailleur mechanism is less complex as shown below. The two plates move
the chain sideways to transfer it from one chainwheel to the other. The chain
tension is adjusted by idler pulley movement in the rear derailleur. The
cage is only in contact with the chain during gear changing and friction losses
are unimportant. The sides of the cage must be parallel to the chain to
effect a clean gear change, and tooth design on the chainwheel can be made to
reduce wear during the chain transfer. |
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