The Simson Chain Normal Strong is a high quality extra strong bike chain suitable for city bikes without gear and bikes with a SACHS or Sturmey Archer hub gear. This chain has 112 links and a size of 1/2 "x 1/8". The chain can be customized using a Simson chain tool. Put the chain on the sprockets and close the ends of the chain together by snapping in the included connecting link.