Slipping dynamo cured?

In article <[email hidden]>,

John Tomlinson said:

Ok explain this one:

I have been struggling with a slipping dynamo for the last few weeks
[1]. Last night I was getting desperate, it was raining and the
roller was slipping continuously, hence I only had my rear backup LED.
In my desperation I decided to try running the roller on the wheel rim
as I thought that might be more dry than the tyre - of course this did
not work either. So I gave up and re-align the roller back on the tyre
only to find that the dynamo suddenly seemed to get traction and
started working.

I realised, in my haste, I had not aligned the roller back onto the
dynamo sidewall of the tyre, but onto the smooth part of the tyre
between the dynamo track and the rim.

Why would the roller work on the smooth tyre and not on the ridged
dynamo track of the tyre?

I will just say that I carefully aligned the bottle to run
tangentially with the wheel each time I made an adjustment. I have
also tried miss-aligning the bottle to stop slipping; I think someone
once recommended this here - but this has never worked for me.

John T.

[1] A Nordlicht with a new rubber roller on a Dynashoe bracket. The
Tyres are conti TT. 2000s.
Remove the singers of Spam before replying

I've come to the conclusion that there's nothing magical about the
dynamo tread - I think if anything it's just intended to be a
'sacrifical' bit of wheel, so it doesn't matter when your dynamo wears
that bit of tread off.

More generally, I changed the rubber wheel on my dynamo for a wire
all-weather one and never again had slipping problems. The rubber wheel
drove me insane.

Ian
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Have not a dynamo for over 40 years now but the trick we used to use then
was to put a rubber ring around the top of the roller. Where did we get the
said rubber ring? From the top of pop bottles - not sure if any bottles are
available now that would do though.

Cheers.

In article <[email hidden]>,

nobody760 said:

Have not a dynamo for over 40 years now but the trick we used to use then
was to put a rubber ring around the top of the roller. Where did we get the
said rubber ring? From the top of pop bottles - not sure if any bottles are
available now that would do though.

Grolsch bottles?

Ian
--
My email address is invalid to prevent spam.
Real contact details are on my website at http://www.drianwalker.com

John Tomlinson said:

Ok explain this one:

Can't, but I can explain it's much, much, much better to use a dynohub.

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/

Peter Clinch said:

John Tomlinson said:

Ok explain this one:

Can't, but I can explain it's much, much, much better to use a
dynohub.

Unless, that is, one has a Trice or similar...

--

Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/
World Domination?
Just find a world that's into that kind of thing, then chain to the
floor and walk up and down on it in high heels. (Mr. Sunshine)

John Tomlinson said:

Ok explain this one:

I have been struggling with a slipping dynamo for the last few
weeks...

The explanation is that you're not using a hub dynamo 🙂

Dave Larrington said:

Unless, that is, one has a Trice or similar...

Or an 8 Freight... I believe I read somewhere (probably VV) that SON
are working on one that will go on the back, though ICBW. One that goes
on a single sided mounting would be very nice for the 8, though I
suppose I'd need to start buggering about with disc brakes too. Bah!

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/

John Tomlinson said:

Why would the roller work on the smooth tyre and not on the ridged
dynamo track of the tyre?

Perhaps because more surface area of rubber = more grip, like slick
(bicycle) tyres grip tarmac better than knobbly ones.

~PB

Ian Walker said:

More generally, I changed the rubber wheel on my dynamo for a wire
all-weather one and never again had slipping problems. The rubber wheel
drove me insane.

Yes, I wish I'd done that years ago. Tried the wire brush wheel for the
first time last night and not only did it not slip in the puddles, it's
much quieter and the noise it makes is actually rather soothing compared
to the plastic roller. That made a nasty high-pitched whine, rising and
falling when honking uphill, and chirruped every time I hit a pothole.

Peter Clinch said:

John Tomlinson said:

Ok explain this one:

Can't, but I can explain it's much, much, much better to use a dynohub.

Pete.

I wonder what Santa will bring me...

John T.

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Zog The Undeniable said:

Ian Walker said:

More generally, I changed the rubber wheel on my dynamo for a wire
all-weather one and never again had slipping problems. The rubber wheel
drove me insane.

Yes, I wish I'd done that years ago. Tried the wire brush wheel for the
first time last night and not only did it not slip in the puddles, it's
much quieter and the noise it makes is actually rather soothing compared
to the plastic roller. That made a nasty high-pitched whine, rising and
falling when honking uphill, and chirruped every time I hit a pothole.

Where do I get these wire wheels from, does anyone know. This is
assuming Santa does not bring me a SON.

John T.

PS my news server did not show me Ians original post, but I can see
Ians other posts - strange.

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John Tomlinson said:

Where do I get these wire wheels from, does anyone know. This is
assuming Santa does not bring me a SON.

They only fit B&M dynamos, but the B&M 6 is fairly inexpensive.

"Zog The Undeniable" <[email hidden]> wrote in message
news:41796b75.0@entanet...

Quoted message said:

John Tomlinson said:

Where do I get these wire wheels from, does anyone know. This is
assuming Santa does not bring me a SON.

They only fit B&M dynamos, but the B&M 6 is fairly inexpensive.

BTW one thing to watch with them - if you get the 'mo alignment wrong, it
will chew the tyre up pretty promptly!

(bad thing on wife's brompton, which is prone to knocks. SON much better)

cheers,
clive

Zog The Undeniable wrote:
[wire rollers]

Quoted message said:

They only fit B&M dynamos, but the B&M 6 is fairly inexpensive.

Indeed, and they also feature a variable contact force widget. When I
started with one on the 8 Freight it slipped terribly, but winding up
the contact force completely solved the problem. I've got a wire roller
in reserve, but haven't had to bother fitting it yet.

The B&M6 has done okay on the 8 Freight and I'm quite happy with it, but
the only reason it doesn't have a dynohub is it won't take one (single
sided wheel support and hub brakes). Note that you don't need a SON to
be ahead of a bottle: the Shimanos are okay, the Nexus reckoned to be
very good bang per buck and the new XT and Ultegra models better still,
though a bit more and still not up to the SON's very high standards.

Pete.
--
Peter Clinch Medical Physics IT Officer
Tel 44 1382 660111 ext. 33637 Univ. of Dundee, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net [email hidden] http://www.dundee.ac.uk/~pjclinch/