Kmc b1s chain nickel plated and brushed chain suitable for internal gear hubs or single speed bikes features size 12 x 18 links 112 links pin length 92mm compatibilty for internal gear hubsingle speed material nickel plated finish bushed 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 be