WikiPedalia is not endorsed or affiliated with the Wikimedia Foundation.
Indexed Shifting
From WikiPedalia
Indexed shifting means that the shift control has positive detents or click stops that provide discrete positions corresponding to different gears. See friction shifting.
If your bike has old fashioned friction shifters, consider upgrading to a modern indexed system. This is a major, very worthwhile upgrade.
Internal-gear hubs have had index shifting throughout their history.
Parts must be matched for index shifting to work correctly: the shift control must match the derailer and cassette sprocket spacing, or the internal hub. Use of mismatched or misadjusted components can put your bicycle in a "between gears" condition.
