We recommend removing/not using the o-ring which sits between chainring and the lockring when assembled with our direct mount ring.
BOSCH G4 motor assemblies come with BOSCH Supplied lockrings and o-rings for assembly with their spider. When using e*thirteen e*spec direct mount rings, the lockring should be used and installed per BOSCH Specification; however e*thirteen does not recommend the use of the O-ring. We have found it can bunch and interfere with proper torque of the lockring, and flatness of the chainring. This assembly variance has BOSCH Internal approval.