KMC Bosch Gen2 Front Narrow Sprocket

Item number: 70543

KMC Bosch Gen2 Front Narrow Sprocket - black/21 tooth

For best power transmission: the Bosch Front Narrow E-Bike sprocket by KMC

The KMC Front Narrow sprocket is a chainring optimised for E-bikes, intended for use with Bosch Gen2 drives. It is characterised by durability and perfect power transmission. It is made of hardened CroMoly steel.

Guidelines for the parts replacement of E-bikes:

Please follow the Guidelines for parts replacement of CE marked E-bikes / pedelecs with pedal assist.

Specifications:

Application:: E-Bike
Mount:: Bosch Gen2
Teeth:: 15 t, 18 t, 19 t, 20 t, 21 t
Gearing:: 1x11-speed, 1x10-speed, 1x9-speed, singlespeed

Technical Information:

Material:: steel (CrMo)

Compatibility:

KMC e11
KMC e10
KMC e9
KMC e1

Features:

1/2" x 11/128" (extra narrow)
optimised for E-bikes
maximum longevity
perfect power transmission
hardened steel
simple conversion

Manufacturer Part Numbers:

15 tooth:: BSFB5015
18 tooth:: BSFB5018
19 tooth:: BSFB5019
20 tooth:: BSFB5020
21 tooth:: BSFB5021

Customer Reviews (2)

Information on the Collection of Customer Ratings

Our website displays reviews from before and after 28.05.2022. As of 28.05.2022, only reviews stemming from verified purchases will be published on our website, which means that an order number must also be provided along with the review. We will only display the review and/or rating after successful verification of the order number. All reviews stemming from a verified purchase are given a green check mark, which applies to all verified reviews prior to and following 28.05.2022. Before 28.05.2022, reviews were also published from customers who did not purchase the reviewed product(s) from us. These reviews have not been given a green check mark. We publish all properly submitted reviews.

5.0/5.0

Give us your opinion on this product.

by Reinhold L. on 22.06.2024 item: black/15 tooth

Ersatz für E-Bike Antrieb

Is this review helpful?

by Reiner H. on 24.05.2022 item: black/18 tooth

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Give us your opinion on this product.

Anything your bike needs, we’ll make it happen

Mii K.

Excellent product range, great pricing, quick international delivery and outstanding customer service.

Steven A.

The team at bike-components is simply superb. Their service is fast. And they care about you.

Paul S.

Great prices and fast shipping for being 1/2 way around the world.

M Saleem

A seriously great company to do business with. I don't usually recommend anyone unless they are this good. Very helpful, good communications. well done bike-components!

Fast delivery. Excellent customer service.

Henrik N.

Always a pleasure to shop at bc. Good service, fast shipping and fair prices. My lbs on the internet.

Michael,

Customer Service Representative

100 Day Return Policy

Send your unused goods back within 100 days after purchase and get your money back!

KMC Bosch Gen2 Front Narrow Sprocket

For best power transmission: the Bosch Front Narrow E-Bike sprocket by KMC