KMC Chainring - 38T Bosch Gen 4

The KMC 38T Sprocket for Bosch Gen4 Super Narrow is designed for Bosch 4th generation e-bike syste...

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Bosch Black Gen 4 Super Narrow Chainring - / 38

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Product Information

Full details

This KMC 38T Chainring is designed for Bosch Gen 4 e-bike systems, offering enhanced performance and battery efficiency. Ideal for riders seeking a durable and precise drivetrain upgrade, its primary benefit is optimized power transfer and extended range. A potential consideration is its specific compatibility with Bosch Gen 4 systems.

All features

Model Part Number	KLS338B
Brand	KMC

Extended Product Information

FAQs

What e-bike systems is this chainring compatible with?

This KMC chainring is specifically designed for Bosch 4th generation (Gen 4) e-bike systems with a direct mount crankset.

What is the offset of this chainring?

The chainring has a 4.5mm offset, which is optimized for many Bosch Gen 4 system configurations.

What KMC chains work best with this chainring?

For optimal performance and durability, KMC recommends using this chainring with their e-bike specific chain series, including the e1, e8, e9, e10, e11, and e12.

How does this chainring help save battery life?

Its precise design and super narrow profile contribute to more efficient power transfer from the motor to the drivetrain, reducing energy loss and helping to extend battery range.

Is this chainring made of steel?

Yes, the chainring is constructed from hardened chrome-molybdenum steel for maximum durability and performance.

Can I use this chainring with a non-Bosch e-bike system?

No, this chainring is specifically engineered for and compatible only with Bosch Gen 4 e-bike systems.

Troubleshooting

Chain skipping or poor shifting

Ensure the chainring is correctly installed with the proper torque. Check for chain wear and replace if necessary. Verify compatibility with the specific KMC e-bike chain being used.

Chainring makes noise

Clean the chainring and chain thoroughly. Ensure proper chain lubrication. Check for any debris caught between the chainring and crank arm or chainstay.

Difficulty installing chainring

Confirm that you are using the correct tools for Bosch Gen 4 direct mount systems. Ensure the chainring is aligned correctly with the motor interface.

Pros and Cons

Pros

Maximum durability and performance from hardened steel.
Optimized for Bosch Gen 4 e-bike systems for seamless integration.
Helps conserve battery life through efficient power transfer.
Ensures smooth and reliable shifting for a better riding experience.
Designed for extreme durability and extended drivetrain life.

Cons

Only compatible with Bosch Gen 4 e-bike systems.
Requires specific KMC e-bike chains for optimal performance.
Direct mount design may not be compatible with all crankset types.
Offset specification is fixed and may not suit all frame/chainline configurations.

Setup, Compatibility & Care

Compatibility: This chainring is specifically designed for Bosch 4th generation (Gen 4) e-bike systems with a direct mount interface. It features a 4.5mm offset. For optimal performance and compatibility, it is recommended to use it with KMC e-bike chain series such as the e1, e8, e9, e10, e11, and e12.

Setup: Installation requires specific tools for direct mount chainring removal and installation on Bosch Gen 4 cranksets. Ensure the mounting bolts are torqued to the manufacturer's specifications to prevent damage and ensure secure attachment.

Care: To maintain performance and extend the life of the chainring and drivetrain:

Clean Regularly: Remove dirt and debris with a brush and a mild degreaser. Avoid high-pressure water jets.
Lubricate Chain: Apply a suitable bicycle chain lubricant after cleaning and drying, ensuring it penetrates the chain rollers.
Inspect for Wear: Periodically check the chainring teeth for signs of wear, such as hooked or sharpened teeth. Replace if significant wear is observed.