Kmc z8rb anti rust 8 speed chainkmc is a pioneer in anti corrosion coated chains and a true market leader the maximum rust protection is produced withnon toxic environmentally friendly materials all complying to european standards features 12 x 332 116 links pin length 71mm compatible with 6 12 18 21 24 speed for city mtb race trekking and hybrid rust buster coated less maintenancerust reduces chain life reduces the drive trains efficiency has a negative influence on the chain