The 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.