Speed count does not establish a shifter match on its own. The derailleur actuation family and control clamp must also agree with the bike. Product pages keep those requirements separate and cited.
- 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.