| Electrical Ratings: | 6V / 3W (per German vehicle standards) |
| German vehicle standards #: | ~~~K179 |
| Allowed wheel diameters: | 26" - 28" |
| Efficiency: | 65% at 15 km/h (10 miles/hr) |
| Power loss during no-load operation: | 0.5 Watt at 15 km/h (10 miles/hr) |
| Magnet rotor: | Neodymium-Iron-Boron, 26-pole |
| Contacts: | 4.8mm flat pin, two pole, floating |
| Wiring: | Coaxial cable, 3 mm |
| Switching: | Switched on/off by headlight |
| Axle: | Cold-formed stainless steel, 10-mm diameter |
| Bearings: | Grooved ball bearings, 629 2RS1 |
| Seals: | Space sealing and gaskets |
| Hub housing: | Polished Aluminum 6012 |
| Spoke holes: | 36 or 32 |
| Weight: | 580 g (without skewer) |
| Full supply name (for ordering): | Schmidt's Original Hub Dynamo and hexagonal nut skewer |
| SON20: | for 16"-20" wheel diameters
(compliant with German vehicle standard ~K165) |
| 'S' models: | for International Standard 2000 compliant disc brakes
(this includes all current Magura and Shimano models) |
| Alternate spoke hole numbers: | 24, 28, 40, 48 |
| Alternate color: | Black anodized (only on SON28/SON28S with 32 spoke holes) |