18307-2RS Wheel Bearings 18 x 30 x 7mm – Chromium

• Bearing ID: 18mm
• Bearing OD:  30mm
• Bearing Thickness: 7mm
• Material: Chromium Steel GCR15 (Race & Balls)
• Used On: Wheels (DT Swiss Hubs)
• Grease: SINOPEC HTHS Bearing Grease, 30% filled
• Seal: Double-sealed 2RS

This bearing is a peculiar bearing as it’s only 1mm different to 6903-2rs which has a  17mm ID, instead of this bearing at 18mm ID.  Appears on hubs made by DT Swiss.