Genuine Brompton replacement chain. The length of chain required depends on your setup: 96 link for 3-speed bikes with 12T/13T/14T rear sprocket and 44T chainring 98 link for 3-speed bikes with 50T chainring, or 6-speed bikes with 44T chainring 100 link for 2- or 6-speed bikes with 50T chainring, or 3-speed bikes with 13T rear sprocket and 54T chainring 102 link for 2- or 6-speed bikes with 54T chainring You can purchase a chain with a greater number of links and shorten accordingly.
