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Old 12-30-11, 06:16 PM   #1
RFC
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Advice please re dynamo bottle systems

These dynamo threads always get me interested.

I am thinking about trying a bottle dynamo system.

What would you recommend as a set up?

What about the Spanninga Wave Dynamo?

Thanks
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Old 12-30-11, 07:28 PM   #2
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I don't have one, and probably never will. BUt the Spanninga seem like a good choice. My experience with bottle dynos is pretty good, when I did use one I always used a tire on the dyno wheel because it reduces noise and bike tire wear.
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Old 12-31-11, 12:23 AM   #3
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I've got a question about the bottle dyno as well. Tire wear was mentioned in the previous post and I'm wondering just how quickly one of these things wear down a tire?
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Old 12-31-11, 12:50 AM   #4
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I heard good things about Axa HR. I keep one as a back-up, but have not managed to test it out yet. Unless you were using a wire-brush on top of a roller, you should not need to worry about the tire wear, with the tire wearing out first from working against the road.
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Old 12-31-11, 05:17 AM   #5
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Tyre wear should not be an issue, but it does pay to have tyre sidewalls that are designed for use with a bottle dynamo - otherwise excess pressure may be required to reduce slippage and increases drag.

It has been a long time since I have used a bottle dynamo, and TBH since I have used a hub dynamo I will NEVER go back to bottle.

I goy a Shimano Alfine dyno-hub for ~50 GBP, new spokes for ~30 GBP and fitted for ~20 GBP, so a grand total of about 100 GBP. You can pick up a nexus dyno hub for ~25 GBP, normal spokes (I went for very specific spokes) will probably set you back ~15 GBP - which drops it down to about 60 GBP - of course, you can always look for a prebuilt wheel to give you the option of no dynamo as well if you prefer.

Don't get me wrong, bottle dyno's are OK, I would even go so far as to say good - but hub dyno's are much better.

Just my $0.02
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Old 12-31-11, 06:14 AM   #6
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So tire wear apparently isn't a big of a concern with the sidewall dyno's as I thought. However, I do perceive another potential problem. Should the wheel come out of true, then the contact point will be either closer or further away.
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Old 12-31-11, 12:39 PM   #7
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If you ride at night a lot, a dynamo hub is definitely the way to go.

But bottle dynamos definitely fill their niche, and they do it well.

Last edited by christ0ph; 12-31-11 at 12:46 PM.
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Old 12-31-11, 12:54 PM   #8
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So tire wear apparently isn't a big of a concern with the sidewall dyno's as I thought. However, I do perceive another potential problem. Should the wheel come out of true, then the contact point will be either closer or further away.
get a better wheelbuilder?
Any bottle dyno worth having has a spring that will accommodate some tire/wheel wobble. I probably wouldn't put a bottle dyno on something like a Conti gatorskin because there is effectively no rubber on the sidewall. Although I usually ran mine on the tread anyway.
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Old 01-04-12, 07:28 AM   #9
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Where do you like to mount yours?

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Although I usually ran mine on the tread anyway.
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Old 01-04-12, 08:35 AM   #10
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I always used fork mounted dynamos. Up far enough on the fork that they ran on the tread, but not too far up.
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