105 now gains the light and responsive shift action found in Dura-Ace and Ultegra Levers, with a new compact shape that’s been borrowed from the levers of Shimano’s more expensive groupsets. The lever can also be adjusted to accommodate different hand sizes.
The new 5800 Crankset features a new four-arm Hollowtech II design similar to that of the current Ultegra and Dura-Ace. The new chainset is stiffer and lighter than the five-arm design it replaces and Shimano have reinforced construction around the chainring area to further improve the stiffness to weight ratio.
The new 105 11 Speed Cassette uses close ratios that Shimano say optimise rhythm and cadence control - available in a range of sizes
The new CN-HG600 11-Speed Chain uses Shimano’s low friction surface treatment known as SIL-TEC.