Core e*spec Chainguides offer a lightweight, durable chain retention solution for Bosch CX Gen5, with 55mm chainlines. Core e*spec Guides are designed to provide the long-lasting performance of an alloy backplate guide, with a wider 55mm chainline for modern Boost and Super Boost e-bikes. They feature a wider offset to accommodate 2-pc chainrings, which often have clearance issues, and our latest e*spec upper sliders, which provide unprecedented retention while improving ease of setup and maintenance. Adjustable upper slider Durable aluminum backplate Includes ISCG mounting hardware for 55mm chainline Backplate material: 2-Bolt Aluminum Backplate Capacity: Bosch CX Gen5: 32-36T Shimano EP8: 34-38TChainline55mm Boost & Super Boost Color: Black Compatibility: 55mm chainline drivetrains Features: Adjustable upper slider with removable front plate for simplified setup and maintenance Included: Chainguide, ISCG bolts x 2 Mount: Bosch CX Gen5 Weight: 53g