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The front derailleur trim on a road bike is a feature that allows for slight adjustments to the position of the front derailleur when shifting gears on the chainrings. It helps to prevent the chain from rubbing against the front derailleur cage in certain gear combinations, ensuring smooth and quiet operation. Here's an explanation of how front derailleur trim works and how to maintain perfect trim: How it Works: Chainrings: Road bikes typically have two or three chainrings at the front, known as the chainring set or crankset. The front derailleur moves the chain between these chainrings to change gears....

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