The AMg (the "All-Mountain" guide) combines a lightweight upper guide and a durable bashguard. Unlike the cheap, flexy, and rattle-prone upper guides found on competitor's products, the AMg features our premium, stiff, silent upper guide and fibre-infused bashguard.FeaturesFOREFRONT -The 'Forefront' feature allows for 4-way, front-accessible setup and adjustment. This broad adjustability makes installation less 'trial-and-error' and more 'set-and-forget.'Pop-UP -The 'Pop-Up' feature allows tool-free chain access - simplifying installation and drivetrain maintenance. The guide pops-up and snaps shut with satisfying and secure clicks.SpecificationMaterial: Alloy (SL model)Chainring Range: Choose from 28-32 or 32-36t models.Drivetrain Compatibility: Internally shaped to accommodate even super-wide ratio cassettes and wide chainlines.Mounting Options: ISCG-05 only.Bashguard options: AMg SL and SLR 28-32t use bashguard 'A', AMg SL and SLR 32-36t use bashguard 'B'