Redesigned with trickle-down technology from Ultegra and Dura-Ace groups, the Shimano 105 CS-5800 Cassette is now available with 11 speeds and features optimized shifting across the entire gear range. Small gear steps improve overall rhythm, which in turn gives you smoother, more consistent and controlled cadence.

• Optimizes shifting across the entire range of gears
• Same gear thickness as the cogs on the CS-5700 10-speed cassette
• Lightweight full aluminum spider
• Durable, nickel-plated steel cogs