FS: Dymotec 6 Generator NIB

[Eric Norris]

I know there’s been some interest on this list for this item in the past, so …

Going through some of my bike paraphernalia a few days ago, and found a new-in-box B&M Dymotec 6 bottle generator. This is a classic, “bottle”-type generator that mounts to the frame and runs on the side of the tire to generate 6 volt/3 watt power. 

Peter White used to sell them—here is his archived page about the Dymotec 6:

Per Peter (and my experience), this will power modern 6-volt lights, with or without a taillight (max of 3 watts of power draw).

The one I have is for mounting on the left side of the bike (it won’t work on the right side). The box has just the generator; you will need to supply the mounting hardware.

How about $45 shipped in the USA?

Let me know if you have any questions!

--Eric Norris
campyo...@me.com
Insta: @CampyOnlyGuy
YouTube: YouTube.com/CampyOnlyGuy 

[Patrick Moore]

Am I correct in thinking that the Dymotec has less drag than the old Union and Sanyo bottles? I thought of getting a Dymotec at one point but the bike it was to be used on never materialized.

FWIW, IME, even the old Union and Sanyo bottles weren’t horrible; not at all like the Bart Simpson clip. Basically you move to 1 tooth bigger in back, if even that — like a light headwind or very slight incline.

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Patrick Moore

Alburquerque, Nuevo Mexico, Etats Unis d'Amerique, Orbis Terrarum

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[Peter White]

The Dymotec 6 was state of the art 25 years ago. If I remember correctly, the drag (if correctly aligned) was about twice the drag of the SON dynamo hub, which is extremely low. There was a higher spec version, the S6, which had even lower drag by somehow introducing negative feedback. The S6 was a fair bit more expensive. Then there was the S12, a 12 volt version which powered 12 volt lights.

Alignment is critical. If it's off by just a bit, the rubber roller will melt from the friction. So when aligning it, be sure that the axis of the dynamo intersects the axis of the hub.

PJW

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Peter White