MRP GCX Braze-On Chainguide The Perfect Guide For Gravel and CXIs your chain falling off during your gravel ride? You might need a chainguide to keep your bike running properly. The MRP GCX Braze-On Chainguide is the perfect guide for gravel and cyclocross riders and racers wanting a bulletproof, single-ring front drivetrain. It is lightweight, quiet, and maintenance-friendly. It is designed to fit 38 - 46T chainrings, is internally shaped to accommodate 44 - 51mm chainlines, and works with braze-on mounts. Features Pop-Up feature allows for tool-free chain access Designed for braze-on mounts and 38-46T chainrings Internally shaped to accommodate 44-51mm chainlines | Mrp | Gcx Braze-On Chainguide Braze-On