S
Simon Proven
Guest
On May 28, 8:41 am, Tosspot <[email protected]> wrote:
> Nigel Cliffe wrote:
> > John Halliwell wrote:
>
> >>There have been several recent posts referring to hub dynamos, I've
> >>seen a few photos of these things, but how do they work?
>
> >>What's inside the hub and what happens when you switch it off? When it
> >>is off, what is the effect on the rotation of the wheel?
>
> >>Apart from the old barrel dynamos, are there any other alternatives?
>
> > Newer barrel generators
. Which are somewhat better in design than many
> > older models. I've had no problems with a B&M generator on my oldest bike.
>
> > Bottom bracket generator. Not seen one for a while, but expect someone still
> > sells them. I ran a Sanyo for nearly 20 years. When its bearings failed, I
> > got the B&M above.
>
> > Dis-engageable hub generators. Have some tabs which engage with spokes,then
> > usually drive a small belt to a generator. Can be disengaged when not
> > required. Not tried one.
>
> > My touring bike has a Shimano £60 hub generator, powering a 3W headlamp.
> > Lowest hassle of any lighting system I've used; turn on when needed, turn
> > off when not needed.
> > Drag when off not detectable in riding. Drag when on is only just felt if I
> > look for it.
>
> Go to the B+M Senso lights. Save yourself the work of even sitching
> them on and off!
Anyone know if they actually go "open circuit" when off (via the
Senso thing)? My guess is they don't.
> Nigel Cliffe wrote:
> > John Halliwell wrote:
>
> >>There have been several recent posts referring to hub dynamos, I've
> >>seen a few photos of these things, but how do they work?
>
> >>What's inside the hub and what happens when you switch it off? When it
> >>is off, what is the effect on the rotation of the wheel?
>
> >>Apart from the old barrel dynamos, are there any other alternatives?
>
> > Newer barrel generators
. Which are somewhat better in design than many> > older models. I've had no problems with a B&M generator on my oldest bike.
>
> > Bottom bracket generator. Not seen one for a while, but expect someone still
> > sells them. I ran a Sanyo for nearly 20 years. When its bearings failed, I
> > got the B&M above.
>
> > Dis-engageable hub generators. Have some tabs which engage with spokes,then
> > usually drive a small belt to a generator. Can be disengaged when not
> > required. Not tried one.
>
> > My touring bike has a Shimano £60 hub generator, powering a 3W headlamp.
> > Lowest hassle of any lighting system I've used; turn on when needed, turn
> > off when not needed.
> > Drag when off not detectable in riding. Drag when on is only just felt if I
> > look for it.
>
> Go to the B+M Senso lights. Save yourself the work of even sitching
> them on and off!
Anyone know if they actually go "open circuit" when off (via the
Senso thing)? My guess is they don't.
