Why Is the Shimano Dura-Ace 10-Speed 11-21T Cassette Built for Racing?

This Shimano Dura-Ace 10-speed cassette in the classic 11-21T specification is the archetypal close-ratio racing cassette, delivering tightly spaced gears for maximum cadence control on flat and rolling race courses. Built to Dura-Ace standards with Shimano's HYPERGLIDE shifting technology, the 11-21T range is optimized for criterium racing, flat stage racing, and any situation where maintaining a precise, efficient cadence is more valuable than low-end climbing gears. A legacy spec with enduring relevance for flat terrain and track-inspired road builds.

Compatible with all Shimano 10-speed road drivetrains. Requires a standard 10-speed freehub body and a Shimano 10-speed chain.