Kmc z1x ept e bike chain kmcs latest breakthrough in rust protection ecoproteq treatment doubles rust resistance compared to the rust buster treatment benefits of the smoother coating are less noise great performance maximum rust resistance and a great look higher inner plates prevent chain drop features 12 x 18 112128 links pin length 86mm for internal gear hubsingle speed extra long version for e bike rust buster coated less maintenance high reliability no drop ecoproteq anti rus