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The Race Face Narrow/Wide Shimano 12-Speed Single Chainring is the perfect choice to run on your Shimano 12-Speed drivetrain. Its got the Race Face narrow wide tooth profile and is suitable for a 104 BCD spider fitment. It's stiff constructions which means all your pedalling effort is focused in the right place. Its made of a 4mm thick 7075-T6 alloy plate for big time stiffness and superhero strength.Compatible With: 104 BCD 4 arm cranksMaterial: 7075 aluminiumRing Style: 1XWeight: 85g (34T)PLEASE NOTE: These chainrings are only compatible with Shimano 12-speed MTB chains.