Gates Carbon Drive CDC Steel Rear Sprocket No Grease. No Rust. No Excuses. If your belt drive e Bike or longer-distance commuter is due for a sprocket swap, this is the part that keeps the system running clean. The CDC Steel Rear Sprocket is matched to the CDC belt line and carries the Center Track(TM) groove design that keeps your belt tracking straight under load. Hardened steel construction handles the constant torque of mid-drive motors without wearing out on you, and because it's part of the belt drive system, there's no rust, no grease buildup, and no chain stretch to manage. Confirm your tooth count and hub interface before ordering to make sure it drops in correctly. Features Hardened steel construction resists wear under sustained mid-drive motor torque for long service life Center Track(TM) sprocket design center groove keeps the CDC belt tracking reliably without derailing CDC system compatibility matched to CDC belts for mid-drive e Bikes producing up to 75 Nm of torque No lubrication required rust-free, grease-free operation with no chain stretch to monitor or correct | Gates Carbon Drive | Cdc Steel Rear Sprocket 22T (3-Lobe Surefit)