SON 28

The Standard

SON 28 means „Schmidts Original Nabendynamo“ (Schmidt‘s original hub dynamo) with general approval for wheel sizes up to 700c (29)”. The new model is produced since autumn 2011.
The SON 28 is similar to the SONdelux in its build and looks. Flange and bearing distance (of the non-disc version), however, are much larger, so that it is the big brother of SONdelux not only electrically, but also mechanically. 

Rated voltage and output are already achieved at a riding speed of approx 20% less than in the SONdelux. Therefore, the SON 28 is recommended if a lot of light is needed at low speeds or when other devices are to be operated.

Easy running (with and without light) characteristics are between the SONdelux and the best competitor models. The no-load power input is lower by 15% in comparison with the SON 28 klassik (model year 2000 until 2011).
Its weight could also be reduced by 140 grams (approx. 25%) compared to the SON 28 klassik. Disc brake versions with 6-holes and center-lock-attachment are available, also SON 28 hubs with 15mm axle and 6-bolt disc mount. 

SON 28 for rim brake

All colors of SON 28 for rim brake use.

QR SON 28 hubs with 6-bolt

All SON 28 hubs with quick release and 6-bold disc mount

SON 28 with center lock

All SON 28 with center lock disc mount.
 

Dynamo hub or axle?

So far the ambitious rider had to do without one or the other. The axle stiffens the suspension fork and allows a more precise positioning of the hub, which is particularly useful for disc brakes. More and more mountain bikers want to take advantage of a hub dynamo lighting system. No wonder that Schmidt saw an increased demand for a thru-axle hub dynamo. 

For this, Schmidt Maschinenbau had to change not only the axle, but also substantial parts of the generator. Result is a hub dynamo similar in looks, strength and electrical values to SON 28 disc, just with a thick "hole". Also, with 460 g the weight could be kept quite low. 

The SON 28 15 disc (6-hole) is available since October 2012 in the colors silver (polished), black and red. 

Spoke Drillings: 32, black also 36 

 

Technical Data 

  • Electrical power output: 6 V / 3 Watts according to the German road traffic regulations StVZO
  • German mark of conformity: ~~~ K834 for 16“ to 29“
  • Efficiency: 65% at 15 km/h in 622 wheel
  • No-load loss: 0.5 Watt at 15km/h in 622 wheel
  • Magnet rotor: Neodymium-iron-boron, 26 poles
  • Contacts: 4.8mm flat spades, 2-pin, to connect without ground connection (special design plugless)
  • Axle: hollow axle, Ø 10mm, strain-hardened stainless steel (center lock®: Aluminium 7075 T6)
  • Bearings: Deep Groove ball-bearing 629 2RSH
  • Hub shell: aluminium 6082, T6
  • Colours: silver polished, anodized black, anodized red
  • Sealing: Alloy dust shields, rubber lip seals and pressure compensation system
  • Spoke drillings: 32, 36
  • Weight: 440g; 6-hole: 460g; center lock®: 430g