|What versions are there?
The original SON with black centersection was superceded by
the current model with removable sidecover: this is smaller with a one
piece shell, the unloaded losses are halved, and the interior can
be accessed without disturbing the spokes. The weight is 20 grams less.
Much lighter again are the XS and R versions which revert back to the
original design in two halves
Will the SON fit my forks?
With 100 mm over the locknut
width and 9mm axle-ends the SON will fit most forks. The stiff
will have no problems with a suspensionfork or a tandem. You can even
a diskbrake version (but no roller or drumbrake)
bikes (eg. Brompton,Dahon, Moulton NS) have a 70-72 mm OLD, for
the SON XS is now available .
Where can I get a SON
In the Netherlands try one
of our dealers. In Germany, Austria and
the Son is fairly common, shops which deal in recumbents or the better
qualty citybikes should have them. Ask the factory
if you have problems. In the UK the dynamo is sold though a few shops.
In the USA try Peter
Can I convert any SON
No, you would have to change
the hubshell which is not available separately.We suggest you sell your
and get a new one with DB flange.
Can I get my SON in a
Yes, if it is polished aluminium;-)
Some SON's are available in black (anodized) but supply is currently
to the 28" 32& 36H versions and the SON R in 20".
Will there be a 12V SON
If you go fast enough you
can power two headlights in series with the current SON's: see 12
V for the theory and here for the
light flashes at low speeds, is there something amiss?
walking-speeds the frequency of the alternator is visible to the human
eye. At speeds over 8 kph the variation in intensity will be impossible
to see. The choice is either a bright and flashing light, or a
and dim one. The bright light offers better visibility
I charge a battery with a Son?
a capacitor supported LED light (eg D-Toplicht rearlight, Lumotec Oval
Plus headlight) will continue for some time, there are allways people
want more. Not only for lights, but to charge that laptop, GPS or
phone on the road. With a 6v rectifier and some ingenuity this should
possible. See the site SON
factorysite for details (Sorry, its in German))
I use the Son without a rear light?
dynamo will generate a current which above a certain speed is fairly
of the load. With only a stock 2.4W bulb the 550-590 mA of the SON will
result in over 7 V, even in headlights with a diode fitted. A normal
will fail within 10 hours, so it is better to fit a 6V
3W bulb, as the Philips HPR64.3W
I fit a Son headlight upside down?
the reflectors in the better bicycle headlights are not symmetrical and
usually of welded construction. Upside down you have lots of stray
in the wrong places (your eyes mostly), and a very light foreground,
not much in the distance. And you run a greater chance of water
the headlight. Special versions of Lumotec and E6 are available on
get funny reading on my Avocet computer
using the SON along with Avocet computers and the ring magnet find the
computer doesn't work properly. The solution is to eliminate the Avocet
ringmagnet, position the sensor next to the hub, and adjust the setting
in the computer. Start with the correct calibration number and divide
by 1.3. Program the computer with the result. The Avocet now works
bearings are shot!
Very unlikely, due to the
strong magnets the axle is very difficult to turn with your fingers. If
you manage to rotate the axle by hand, you will feel the magnet poles
the stator, which gives the impression of a maladjusted bearing.But the
magnet push is as big as the downhill pull, so this evens out. As
long as no current flows, the losses are very small due to the
characteristics of the materials chosen.
Can I use Schmidt headlights
with other hubdynamo's?
Most lights will work with
other dynamo's, if you connect them properly. As dynamo's from
are connected to ground, the lights will not work if you have the wires
switched. Connect the outer wire from the coax to the connector marked
earth. The Schmidt Oval plus has the switch fitted on the earth side,
you won't be able to switch the light off unless you insulate the light
from the frame.
Can I use Schmidt lights
Sorry, no. The switches
in Schmidt lights are not designed to cope with the very large
which occur in battery-setups on switching on. The contacts could be
shut. Better fit a large switch with a fuse near your battery. The E6
is available without switch. The LED lights will not work on DC