Kmc x9e hp ebike 9 speed chain specially designed for middle engine driven e bikes such as bosch panasonic and aeg these chains have higher torsion resistance to cope with ruthless shifting and hi torques features 12 x 11128 136 links pin length 66mm compatible with any 9 speed derailleur system special design for mid motor e bikes double x durability hi pin power hi torsion resistance kmc chainsfor many years kmc has enhanced the technology behind bicycle chains through research deve