KMC MissingLink
If you've ever broken a chain on the road, you know that without the right tools or a spare link, you'll be making a phone call for a ride home. A spare KMC MissingLink in your saddlebag makes that scenario a lot less likely. The KMC Missing Link is available in Campagnolo 11-speed, Shimano 10 and 11-speed, and SRAM 10 and 11-speed versions.