Shimano 105 5800 11sp cassette chain bundlethe headline development for the new 105 groupset is its capacity for 11 speed shifting and shimano has introduced three cassettes with ratios of 12 25 11 28 and 11 32 with the intention of delivering smaller steps between shifts to optimise rhythm and cadence control shimano believes the introduction of the same technology to 105 will help fulfill its remit as a groupset for everyday riding and longer efforts at weekends featuresefficient hg ev