Taking design cues from our class-leading V3 family of 1x guides, the CS model utilizes a stiff and light glass-filled composite backplate and durable nylon upper guide to add major security to your 1x10, 11, or 12-speed drivetrain at minor cost. 28-34t range (oval compatible up to 32t) Boost compatible Glass-filled Composite backplate Two-bolt ISCG-05 mount backplate No crank or chainring removal required for installation