Sturmey Archer CS-RK3 3-Speed Cassette Hub – Rear Disc, 135mm, 32/36H, F30

The Sturmey Archer CS-RK3 (F30) is a rugged and versatile 3-speed cassette-style internal gear hub, designed to offer smooth shifting and minimal maintenance for commuter, touring, and utility bikes. This model supports standard 9/10-speed cassettes, giving you the ability to pair the internal 3-speed gearing with external shifting options for extended range.

Built with 135mm over locknut dimension (OLD) and disc brake compatibility, the CS-RK3 is perfect for modern frame standards, offering a clean, enclosed drivetrain that’s ready for wet-weather commuting and urban riding.

Available in both 32-hole and 36-hole drillings, this hub is adaptable to a variety of wheel builds — whether you're prioritizing weight or strength. The internal gear mechanism reduces exposure to dirt and road grime, increasing long-term reliability with less upkeep.