Kmc z510 chain a gold 18 bmx chain with chamfered inner plates to reduce sprocket rub noise higher inner plates prevent chaindrop compared to other renowned chain brands kmc x series chains live longer as proven in many road tests to back up this claim kmc is the only chain manufacturer offering a unique satisfaction warranty features 12 x 18 112 links pin length 86mm compatible with bmx internal gear hub tensile strength 1200kg bushless construction brass plated low noise no d