Joined: 24 Jul 2005Posts: 942Location: Little Addis Ababa
So, as part of the new DI2 system (the 'Intelligent' shifting setup), it evidently includes a dynohub. The difference being that it is integrated into the rear hub.
Evidently made in rollerbrake and disc versions (from here):
FH-C810 Dynamo Freehub (for Roller Brake) Exploded PDF
FH-C811 Dynamo Freehub (for Disc Brake) Exploded PDF
It's evidently not strong enough to run a halogen, but works well with LED version of dynamo lights.
And since I don't know German, some else's synopsis:
Quote:
I have to admit that even with some knowledge of German this page is
somehow more suitable for the expert reader. To convert frequency to
speed:
v = 2 f / N * 3.6 * C km/h,
where f is the electrical frequency, N the number of poles (22 for this
hub), and C the wheel circumference.
If I read correctly the hub behaves much like a typical dynohub with the
exception of showing a typical current of 0.3A instead of 0.5A.
Efficiency is above 50% while I can't get directly information about
power consumption with the circuit open or shorted. As usual with
dynohubs in pratice I can't tell from the drag if the light is on or
off. In my setup (homemade LED light and small 406 wheel) output is
sufficient from approx. 6km/h on which is sufficient for my local
hills.
Some additional data:
appr. 750g without quick release
6 bolt disc attachment IS2000
135mm, 52mm (35 + 32.5 + 19.5 + 48), 2x 74.4mm
Shimano spec. 55.65mm with 7mm dish
Shimano 4.1V, 1.12W at 110 RPM 15 Ohm
--Gunther Schwarz from uk.rec.cycling:<9806620.vWag9Jz4Dj@news.individual.de>
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Joined: 24 Jul 2005
Posts: 942
Location: Little Addis Ababa
