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The KMC Drive Bosch Gen 2 Direct Mount E-Bike Chainring is an essential upgrade for owners of e-bikes equipped with Bosch Gen 2 Active Line or Performance CX motors who require a durable, long-lasting replacement sprocket. Crafted from hardened Chromoly steel, it offers exceptional resilience and a service life exceeding 3,500km, though users must ensure they specifically match their motor generation and chain type for a precise fit.
| Brand | KMC |
|---|
No, this sprocket is specifically engineered for Bosch Generation 2 motors.
Yes, it is compatible with Super Narrow chains, which include standard multi-speed setups.
For maximum durability, it is recommended to pair this with a KMC e1 or e101 EPT chain.
The product is the chainring sprocket itself; you typically reuse your existing lockring or follow the motor manufacturer's service guide.
Gen 2 motors were generally produced between 2014 and 2018. Check your bike's manual or the motor casing labels for the specific series.
Check for chain wear using a chain checker; if the chain is stretched, both the chain and the sprocket should be replaced simultaneously.
Ensure the lockring is tightened to the manufacturer's specified torque settings; re-check that the direct mount splines are fully aligned.
Installation requires removing the crank arm and using a dedicated Bosch lockring tool to remove the existing sprocket. Ensure the direct mount interface is cleaned of debris before seating the new KMC sprocket. Compatibility is strictly limited to Bosch Gen 2 systems; verify your motor model year (2014-2018) before attempting installation. To maintain the 3,500km+ lifespan, keep the chain clean and lubricated according to your chain manufacturer's specifications, and regularly inspect the sprocket teeth for signs of heavy hooking or premature wear.
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