These chainrings from KMC are suitable for Bosch 3rd generation motors. Guaranteed to last a minimum of 3500km, combining these with KMC's E chains to extend the life of your chain and chainring even further. Longer lasting, quality material and unparalleled gear changes.
Features

Treatment: Hardened Chromoly steel
High efficiency, saves battery 
Extreme durability, highest precision
Simple conversion
Perfectly matched with KMC Chains

Tech Specs

Size: 1/2" X 11/128"
Colour: Black
Treatment: Hardened Chromoly steel
For Bosch 3 systems
Direct Mount; 3mm offset
E1, E12, E11, E10, E9 & E8 chains