Shimano 105 5800 11-Speed GroupsetThe Shimano 105 groupset continues to evolve. This Shimano 105 5800 11-Speed Groupset has successfully narrowed the gap between 105 and Ultegra. Whilst both groupsets undeniably benefit from the joys of trickle down technology of the elder statesman, Dura-Ace, the performance of Shimano’s 105 11-speed groupset is precise, efficient, and reliable Shimano 105 Groupset: Crisp, Light, and StiffEvery facet of Shimano’s 105 groupset has been updated from earlier models to deliver an accurate, crisp, and stiff performance. Lower weight, and now featuring an 11-speed drivetrain, this Shimano 105 groupset opens the door of pro-level technology to part-time racing enthusiasts and recreational cyclists Enjoy clean, crisp, and accurate shifting with Shimano’s 105 groupset as this updated groupset that has been engineered with durability in mind. The ergonomic shifters provide a comfortable hand position when you’re riding on the hoods with braking and shifting easily accessible on the hoods or on the drops Shimano 105 Groupset: the 5800 CranksetThe new Shimano 105 groupset features an overhauled crankset design; the 5800 Crankset has a new four-arm Hollowtech II design similar to that of the current Ultegra and Dura-Ace models. This new crankset is stiffer and lighter than the previous five-arm design, delivering the Shimano 105 groupset with a vastly improved stiffness-to-weight ratio. Hollowtech II design: optimum balance of lightweight and stiffness New gear dimension for great improvements Improved gear for less chain touch in small/small combination Hyperdrive SG-X-chainrings Dual-SIS-compatible Includes Bottom BracketShimano 105 Groupset: Dual Control Shifters Set STI 105 ST-5800:The Shimano 105 groupset 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 Ergonomic designPowerful and controllable braking systemDurableShimano 105 Groupset: Rear Derailleur RD-5800 SSShimano has included a new spring mechanism and cable pitch in the new 105 groupset’s rear derailleur in order to provide robust adjustability Short CageCrisp shiftingPrecise alignmentShimano 105 Groupset: Front Derailleur FD-5800 Braze-OnShimano’s new 105 front derailleur has a longer link arm and a new spring mechanism compared with the last generation component Braze OnCrisp shiftingAccurate alignmentEasily adjustedShimano 105 Groupset: Brakeset BR-5800The Shimano 105 groupset brakes feature a new symmetrical dual pivot caliper design, with a higher arch allowing clearance for up to a 28mm wide tyre. This results in a 10% increase in power Shimano 105 Groupset: Cassette CS-5800Shimano’s new 105 groupset includes a durable 11-speed cassette, which employs close ratios that Shimano believes will optimise rhythm and cadence control Broad range to cope with most terrainDurableShimano 105 Groupset: CN-HG600 11-Speed ChainThe new CN-HG600 11-Speed Chain uses Shimano’s low friction surface treatment known as SIL-TEC. The new chain’s PTFE surface coating reduces friction whilst boosting durability. The technology first debuted on Shimano’s flagship Dura-Ace 9000 Chain a couple of years ago 116 LinksReduced frictionPlease note that this groupset does not come supplied with outer cables.A 2-year warranty is offered with all Shimano products from Chain Reaction Cycles (3 years on Dura-Ace and XTR products) Buy Shimano Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.