Rohloff Hub Noise Due to Loose Sprocket or Lock-Ring

Confirm this cause if the noise is a persistent clicking or metallic rattling that originates from the rear hub area, particularly under load. Verify this by checking the sprocket for lateral play on the splined carrier. Use a torque wrench to ensure the lock-ring is tightened to exactly 30 Nm. If the sprocket moves or the lock-ring exhibits movement when tested, this interface is the confirmed source of the noise.

Sources