Do you know what it's like when your brain hurts from thinking too hard? Well, slap one of these bad boys on your dh-slalom bike and stop thinking about dropping your chain. The Boxguide is adjustable for 34-38 or 34-46 tooth chainrings and there's even a model compatible with the new ISCG mounting standard
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)