Schlumpf introduced a new belt drive system at this year’s Eurobike show. Dubbed the Advanced Belt Drive System (ABDS), the claimed benefits include:
- Using only a few standardized parts, any belt line can be achieved.
- Any belt width for any type of use (heavy-duty applications, light-duty city bikes) can be supported using the same standardized parts.
- A bigger radius at the rear sprocket allows the use of industry-standard belts with a 14-mm pitch.
- Belts with a 14-mm pitch offer a better fit, and need no pretensioning.
- The lack of pretensioning increases overall efficiency, and avoids power losses and wear on the bearings.
- The greater freedom of design makes it possible to design in scoops for mud relief.
The $64 question is whether the large diameter rear sprocket will necessitate the use of a geared bottom bracket like the Schlumpf Speed Drive; the literature seems to imply so.