One of the most common stumbling blocks for people coming into single speed cycling is the difference between 3/32″ and 1/8″sprockets and chains? A 1/8″ chain is the most common chain found on single speeds, and 3/32″ chain is the most common chain found on derailleur equipped bikes. A 1/8″ chain will fit on parts that are either width. 3/32″ chains will only fit on parts designed to work with 3/32″ chains.