Title: KMC Bosch Gen 3 Super Narrow Direct Mount Chainring, Black, 38T, Chainline 47.5mm of 50.0mm. Size: ‎38T, Chainline 47.5mm of 50.0mm. Chainline 47.5mm of 50.0mm. These chainrings from KMC are suitable for Bosch 3rd generation motors.