The SON 28 disc dynamo hub is approved for wheel sizes from 16" to 29". Its nominal output in a 28" bike is reached at ca. 16 km/h (SONdelux 19 km/h). This makes it the ideal choice when you need much light or charging power at low speeds.
The design and internals of the new SON 28 is similar ot the SONdelux. The standard version (non-disc) has a 12 mm wider flange distance and 10 mm more bearing spacing. For disc brakes the it's available with IS 2000 6-hole or a center lock mount. Compared to its predecessor the no-load loss could be lowered by 15% and the weight was reduced by 140 g.
Electric power: 6V / 3W
Approval: ~~~ K 834
Approved wheel sizes: 16" - 29"
Power efficiency 65% at 15 km/h in a 28" wheel
No-load power consumption: 0.5 Watt at 15 km/h in a 28" wheel
Magnet rotor: Neodymium (NdFeB), 26 poles
Contacts: 4.8 mm flat pin plug, 2-pole, floating ground
Axle: Hollow axle Ø 10 mm, strain-hardened stainless steel
Bearings: Groove ball bearings 629 2RSH (SKF)
Hub shell: Aluminium 6082 T6
Colours: silver polished or black anodised
Sealing: Gap ring and gaskets
Weight: 460 g
Warranty: 5 years
Included in delivery: Hub with integrated overvoltage protection, allen-type bolt-on skewer, flat-pin socket for front light