A chain is specified by its speed standard first and its brand second: inner width sets whether it sits on your cogs, and the standard is the shorthand for it. Every chain page lists the standard it requires, with a source.
- How do I know whether a part in this category fits my bike?
- Every part page lists the standards it requires and its computed verdict on each bike in the fleet, with its confidence and sources. An "unknown" verdict means we do not have the measurement on file — not that it fits.