The Shimano 5800 has gone 11 Speed for the latest incarnation of the 105. The 5800 has been inspired by the innovations of the more upper end Shimano Ultegra and Dura Ace; you can see the technological influences across the design of the 5800 components. More advanced and lighter than its predecessors and with a more eye catching design, the 5800 promises high performance and is one of the latest cycling must haves.
High performance HG-EV 11-speed 105 Road cassette
Hyperglide EV sprockets have a computer designed tooth configuration with contoured shift gates, resulting in a crisp smooth shift even under load
Close ratio gearing allows a more efficient use of energy through finer cadence control
Largest sprockets are mounted on a lightweight alloy carrier to reduce weight and increase rigidity
Sprockets are cut away and drilled to further reduce weight without reducing rigidity
Nickel-plated finish offers hard wearing resistance to corrosion
Pearl-bright steel cassette lockring
For Super Narrow 11-speed HG-X chains
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I bought two of these cassettes - they were the best value cassettes that I could find anywhere on the net. I am sold out on 105 cassettes - they are not the lightest that you can get, but extremely durable, and work perfectly with my ultegra and dura ace bikes.
I bought the 11-28 to replace my 11-32 on the stock bike, and have managed the hills to date, and appreciate the closer grouping in mid range.
Works as advertised, and is essential for crazy hills. Barely heavier than the ultegra version (it's on with my ultegra everything else), and comes out of the box so very shiny!
Shifts really nicely, hopefully it will be durable too. I have an 11-28 and the extra cog with 11 speed really makes all the difference over 10 speed 11-28 with the way it ramps up - the gears are more evenly spaced, it's like a 10 speed 11-25 with a 28 added on top