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)