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Friction shifting
From WikiPedalia
Shifting operated by a lever that moves smoothly through its range. With friction shifting, the rider must learn exactly how far to move the lever to get from one gear to another. If the rider moves the lever too far, or not far enough, the chain will not line up properly with the sprocket, causing noise and roughness. See index shifting
If your bike has friction shifters, consider upgrading to a modern indexed system. This is a major, very worthwhile upgrade.
