Kmc s1 single speed chain a chain built for single speedinternal hub geared bikes features 86 mm pin length tensile strength 920kgf pin power minimum 90kgf compatible with single3 speed and bmx bushless construction snap on connector kmc chainsfor many years kmc has enhanced the technology behind bicycle chains through research development continuous innovation and valuable feedback from the worlds top professional racers kmcs pursuit of perfection has led to repeatedly being honoured w