Modern variations in bicycle design require several different chain lengths. Fitting a standard-length replacement chain isnât always an ideal option.M-Wave have made a great solution for professional workshops who need access to specialist chain lengths. Great when a cargo-bike or ârandom Tandemâ turns up looking for a new chain. These 15M Mini rolls of KMC made chain (approximately 10 chains) come in a small box on a cardboard reel that can sit on most shelves and allow the mechanic to pull-out and custom cut a chain to the exact length required. Supplied with 10 joining links.