Shimano Deore XT CN-M8100 12-Speed Chain - 138 Links

The Go-To 12-Speed Chain for XT and Ultegra Builds

The CN-M8100 is Shimano's Hyperglide+ 12-speed chain, and the 138-link version is the long option we keep for full-suspension mountain bikes running big cassettes and for road or gravel bikes that need extra links. The same chain covers Deore XT mountain and Ultegra road 12-speed drivetrains, so one part number covers a lot of bikes in the shop.

Extended inner plates improve chain engagement and retention on rough terrain, SIL-TEC treatment on the roller link plates cuts friction and wear, and the included SM-CN910-12 Quick-Link makes installation tool-free. That Quick-Link is single-use, so keep a spare in the saddle bag if you open the chain for cleaning.

Whether you're replacing a worn 12-speed chain on an XT trail bike or an Ultegra road bike, or building a mixed drivetrain that still uses Shimano 12-speed spacing, the CN-M8100 138-link chain is the length that fits when 126 links come up short.

Shimano was founded in 1921 by Shozaburo Shimano in Sakai, Japan, and the company is still based there today. More than a century later, it's one of the biggest names in cycling components. Deore XT sits just below XTR in Shimano's mountain lineup and brings race-proven performance to trail, enduro and everyday mountain riders.