The DRS Euro Bottom Bracket is a replacement for frames built around a Euro threaded bottom bracket shell. It runs hardened steel case bearings, so the part of the bike taking every pedal stroke is turning on a hard wearing surface.

The bearings are fully sealed, which keeps the grit and water your back wheel throws forward on the outside where it belongs. If your cranks have started to feel notchy or rough through the stroke, the bottom bracket is usually the first place to look.