Better do some reading up on chains. There are quite a few varieties on the loose. Mostly for different gearing. Some for 1/8-inch cranks and cogs as found on 3-speeds and BMX. Most are 3/32nds for derailleur bikes - but different models for 5,6,7,8-speed cassettes/freewheels. 9 and 10 each take a different animal. And Campy has their bloody 11-speed one out there.