KMC Bosch Narrow/Wide Chainrings

A chainring tooth profile with alternating narrow and wide teeth designed to match the inner and outer chain plate spacing. This precise engagement significantly improves chain retention, particularly on 1x e-Bike drivetrain systems with pronounced chain lines.

Features

• Perfectly tailored to narrow KMC chains 
• For Bosch Drive Units BDU38/34, BDU37 & BDU31
• Narrow-wide tooth profile for precise interaction between chain and chainring
• Maximum efficiency which saves battery
• Direct Mount interface
• Recommended chains: e-Series e1 / e8 / e9 / e10 / e11 / e12, DLC12

Tech Specs

• Size: 11/128"
• Chain line: 55mm
• Colour: Black
• Treatment: Hardened Chromoly steel
• Compatible with all 1-8x chains 1/2 x 3/32" and 9-12x 1/2" x 11/128" (except 12/13x flattop chains)

All UK Mainland Bike Deliveries Over £999 - Free Bike orders are sent via TNT/FedEx with estimated delivery within 1 working day after quoted dispatch time (For Scottish Highlands, Northern Ireland, Isle of Man and the Channel Islands deliveries please allow an additional 1-4 working days).Bike orders under £999 and eBikes will incur a £25 delivery fee.

Free Delivery On Orders Over £199.99 - When you spend more than £199.99 at 99 Bikes deliveries to a UK mainland address will be free (excludes bikes & large items).Certain regions and territories of the UK will incur additional charges, details of which can be found on our delivery page.

Click & Collect Orders -Please be aware Click & Collect orders may take some time to fulfil. We advise not to travel to your chosen store until you have been notified that your order is ready for collection.

At 99 Bikes our priority is to ensure that you are highly satisfied with your purchase. In the unlikely event that you aren't, we offer a 30 day online return policy* in which you can receive a full refund. Any item including bikes (with the exception of food) can be returned to us for any reason provided it is received by us in an unused and resalable condition in or with its original packaging which must be undamaged.

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