Kmc z7 chain a 7 speed chain ideal for all types of bikes that run a 7 speed system chamfered inner plates to reduce sprocket rub noise features 12 x 332 116 links pin length 73mm compatible with 6 12 18 21 speed for city and trekking low noisekmc 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 be