SON 28 is a generally approved hub dynamo for all wheel sizes up to 700c (29"). On a 28"-wheel nominal output is reached at about 16 km/h (SONdelux at 19 km/h). SON 28 is recommended when more light is required at low speed or when other devices are to be operated or their batteries recharged.
Compared to the SONdelux, the appearance is similar but the flanges are more widely spaced by 12mm and the bearings by 10 mm.
Disc brake versions are available with 6-hole or Shimano's Center Lock rotor mounting system.
Compared to SON 28 klassik (manufactured from 2000 to 2011) no-load losses were reduced by about 15 % and weight by 140 g.
||6V / 3W according to German government's road traffic regulations (StVZO)
|German Mark of Conformity:
||~~~ K 834 for 16" - 29"
||65% at 15 km/h in 700c-wheel
|No-Load Power Input:
||0,5 W at 15 km/h in 700c-wheel
||neodym iron boron, 26 poles
||4,8 mm flat spades, 2-pin to connect without ground connection (special design without connectors)
||hollow axle Ø 10 mm, strain-hardened stainless steel, (Center Lock rotor mounting system licenses by Shimano: aluminium 7075 T6)
||deep groove ball bearing 629 2RSH (SKF)
||aluminium 6082 T6
||silver polished, anodized silver, black or red
||alloy dust shields, rubber lip seals and pressure compensation system
||28 (only ISO 6-bolt), 32, 36
40, 48 (tandem version with a larger flange)
||440 g (ISO 6-bolt: 460 g, Center Lock rotor mounting system licenses by Shimano: 430 g)
SON 28 with drillings 40 and 48, flange diameter is 15 mm larger than on standard SON 28.
Thus it is possible to build extremely stiff wheels.
For extra wide forks we build SON 28 135 disc.
Flange spacing is 68 mm, symmetric. The rotor is positioned at 15.3mm (standard for rear disc brakes) / 10.4mm (standard for front disc brakes on SON 28 135 disc VR).