Sometimes we will substitute the 2RS for LB/LU they state LB on one side and LU on the other side. LB is non contact seal, LU is contact, so the red LU seal is mounted outwards to face the elements, to help keep out the dirt and moisture for longer.
5DEV Titanium Bottom Bracket | T47
5DEV Titanium Bottom Bracket | BSA | 68-73
5DEV Shimano Steps | EP8 R-SPEC eCrank
5DEV Shimano EP8 E-Bike Titanium Crankset