Clarks half link chain clarks range of chains are offered in a wide range of alternative designs and materials precision engineered and available for all systems and in all specifications whether its a single speed coloured chain for a bmx or an 11 speed self lubricating chain we have it covered half link designed around the specific requirements on single speed track bike and bmx bike usage features cl918 tp hl single speed 12x18x102 links buy clarks components from chain reaction