Seals: LLU. There are many types of seals. Enduro’s seals are usually either LLU (usually the MAX type bearings) or LLB (better for hubs). The outer sealing lip repels dirt and water while the inner sealing lip retains the grease.
6903 LLU MAX | 17 x 30 x 7mm | Blueseal Bike Bearings
ENDURO Bearing 6903 LLU MAX BO ABEC3
6903 LLU MAX-E | Frame Pivot Bearing | by Enduro
6901 LLU MAX | Frame Pivot Bearing | Enduro
6902 LLU MAX | Frame Pivot Bearing | by Enduro
6800 LLU MAX | Frame Pivot bearing | by Enduro