[header] How to measure a bike chain [title] Lay the original chain side by side next to your new chain. [step] If the original chain is the length you want the new chain to be, lay them next to each other so the plates are on their sides. Ensure that the plates on each chain line up. 
If you're using a master link chain, insert the master link so your measurement is accurate. [substeps] For example, line up an outer plate with an outer plate or an inner plate with an inner plate.