BB mount: fits under lip-cup or lockring style bottom brackets. ISCG mount: fits 59.2mm-BCD 3-tab direct-mount bottom bracket shell . 5mm thick 7075 aluminum upper arm with CrMo lower arm. Lightweight upper (delrin) guide box with micro-adjust. Polyurethane lower roller with sealed cartridge bearings. Compatible with most cranks/frames (50mm minimum chainline): 350g. Features: Adjustable for 34 to 46t chainrings, works with most aftermarket cranks and frames BoxGuide is compatible with TruVativ polycarbonate bashguardsingle ring systems

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