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shimano hub dynamo

Old 09-17-04, 02:29 PM
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saturnsc2
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shimano hub dynamo

does anybody use the shimano hub dynamo model dh-3n70? how does it compare to a bottle dynamo? does the lights flicker at slow speed & do you feel pulsing at slow speeds due to the slow rotation of a hub dynamo? how about the drag compared to a bottle?
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Old 09-19-04, 02:32 AM
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Michel Gagnon
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I can't remember if it's Sheldon Brown or Peter White that taks about it, but it is half way between the Shimano Nexus NX-30 and the Schmidt (actually closer to the Schmidt).

I have both -- on different bikes, obviously. One can't feel the Schmidt, but you do feel the NX-30. One feels it typically when turning on the light, but when cycling for a long time, I can't tell there is a real difference in my running speed with or without the generator. Even with the NX-30, friction is definitely way less than with old Union-style and Cibié bottle generators. I think that the modern Dymotec S-6 (cf. Peter White) has less friction than a NX-30 and more than a Schmidt, and of course no friction when the light is off.

With either generator and the Lumotec headlight, there is some flicker around 6-7 km/h and the light becomes stable above that. I can't say if it's because of the generator itself (it provides AC current) or because of the voltage-limiting diode present in the Lumotec.

Two great advantages of the hub vs a bottle generator:
- no slippage in rain or snow
- no noise at all.
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Old 09-21-04, 08:09 AM
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does anybody know where that light sensitive switch mounts for the shimano hub dynamo?
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Old 09-21-04, 02:52 PM
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Michel Gagnon
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I think it should go on the fork blade. But I don't have it, because I use a switched Lumotec.
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Old 09-23-04, 10:06 PM
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Originally Posted by Michel Gagnon
I think it should go on the fork blade. But I don't have it, because I use a switched Lumotec.
i seen pictures on the internet of it installed. it goes behind the fork crown & attaches to the caliper bolt. it would seem to be too close to the frame when you turn your wheel i would think. we'll see how it works when i get it...
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