2nd Hand Bromptons (?!)

I submit that on or about Mon, 26 Sep 2005 20:08:00 +0100, the person
known to the court as JohnB <[email hidden]> made a statement
(<[email hidden]> in Your Honour's bundle) to the
following effect:

Quoted message said:

I met a chap yesterday [1] with an 'upgraded' Brommie that cost him two grand.
It had Rohloff gearing, Hope discs - the lot.

Envy

Quoted message said:

And the chain still came off.

.... which mine never has.

Guy
--
http://www.chapmancentral.co.uk

"To every complex problem there is a solution which is
simple, neat and wrong" - HL Mencken

Just zis Guy said:

Quoted message said:

And the chain still came off.

.... which mine never has.

The only times I have had the chain come off my B is when it has been
lying on its side in the boot of the car, chainwheel upwards. Then the
bumping and shaking can dislodge it from the chainwheel enough that it
falls off next time you go to use it. Otherwise it has stayed on all
the time.

--
Tony

"I did make a mistake once - I thought I'd made a mistake but I hadn't"
Anon

"Just zis Guy, you know?" <[email hidden]>typed

Quoted message said:

I submit that on or about Mon, 26 Sep 2005 20:08:00 +0100, the person
known to the court as JohnB <[email hidden]> made a statement
(<[email hidden]> in Your Honour's bundle) to the
following effect:

Quoted message said:

Quoted message said:

I met a chap yesterday [1] with an 'upgraded' Brommie that cost him
two grand.
It had Rohloff gearing, Hope discs - the lot.

Quoted message said:

Envy

Quoted message said:

Quoted message said:

And the chain still came off.

Quoted message said:

.... which mine never has.

David has managed it as the fold-unfold-fold sequence challenged him a tad...

--
Helen D. Vecht: [email hidden]
Edgware.

Just zis Guy said:

I submit that on or about Mon, 26 Sep 2005 20:08:00 +0100, the person
known to the court as JohnB <[email hidden]> made a statement
(<[email hidden]> in Your Honour's bundle) to the
following effect:

Quoted message said:

I met a chap yesterday [1] with an 'upgraded' Brommie that cost him two grand.
It had Rohloff gearing, Hope discs - the lot.

Envy

Quite. But Hopes are really OTT.

Quoted message said:

Quoted message said:

And the chain still came off.

... which mine never has.

I gathered from the owner it was quite a regular occurrence when riding
off road as the tension spring is not strong enough to take up the
varying chain slack as the bike bounces about.

In the five years I've had mine its 'sort-of' happened once, a couple of
months ago.

I sometimes use the Brommie when taking the Control Skills part of a
training session.
Naturally, the five boisterous lads wanted to see me fold it.
I duly obliged.
The damn tensioner came off and springs washers and bolts deposited
themselves on the grass
:-(

A maintenance session followed ;-)

John B

I submit that on or about Wed, 28 Sep 2005 18:25:17 +0100, the person
known to the court as JohnB <[email hidden]> made a statement
(<[email hidden]> in Your Honour's bundle) to the
following effect:

Quoted message said:

Quoted message said:

Quoted message said:

I met a chap yesterday [1] with an 'upgraded' Brommie that cost him two grand.
It had Rohloff gearing, Hope discs - the lot.

Envy

Quite. But Hopes are really OTT.

Indeed. And you'd be over the bars every other time!

Quoted message said:

Quoted message said:

Quoted message said:

And the chain still came off.

... which mine never has.

Quoted message said:

I gathered from the owner it was quite a regular occurrence when riding
off road as the tension spring is not strong enough to take up the
varying chain slack as the bike bounces about.

Ah, a Mountain Brompton ;-)

Quoted message said:

I sometimes use the Brommie when taking the Control Skills part of a
training session.
Naturally, the five boisterous lads wanted to see me fold it.
I duly obliged.
The damn tensioner came off and springs washers and bolts deposited
themselves on the grass

That, my friend, is Mr Sod and his famous law.

Guy
--
http://www.chapmancentral.co.uk

"To every complex problem there is a solution which is
simple, neat and wrong" - HL Mencken

Just zis Guy said:

Ah, a Mountain Brompton ;-)

Mine sometimes does service as one (overtaking disc equipped MTBs on the
trails near Aviemore is /sweet/), and the tensioner has never acted as
described. Could be different with a Rohloff hacked in there though...

Quoted message said:

Quoted message said:

I sometimes use the Brommie when taking the Control Skills part of a
training session.
Naturally, the five boisterous lads wanted to see me fold it.
I duly obliged.
The damn tensioner came off and springs washers and bolts deposited
themselves on the grass

Quoted message said:

That, my friend, is Mr Sod and his famous law.

The only time I've had chain trouble is when things have got stuck on
the fold. Generally lack of cleaning and lubing of chain and tensioner
arm IIRC, and maybe once where Roos was Working It All Out From 1st
Principles a bit heavy handedly.

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:

Just zis Guy said:

Ah, a Mountain Brompton ;-)

Mine sometimes does service as one (overtaking disc equipped MTBs on the
trails near Aviemore is /sweet/), and the tensioner has never acted as
described. Could be different with a Rohloff hacked in there though...

Quoted message said:

Quoted message said:

I sometimes use the Brommie when taking the Control Skills part of a
training session.
Naturally, the five boisterous lads wanted to see me fold it.
I duly obliged.
The damn tensioner came off and springs washers and bolts deposited
themselves on the grass

What does the LH gear changer do? just been looking at one it seems to
go to the chain guide thingy, hard to tell as it was folded up.

MartinM said:

What does the LH gear changer do? just been looking at one it seems to
go to the chain guide thingy, hard to tell as it was folded up.

The Brompton 6 is actually a 2x3. The 3 is the hub and the two is a
second sprocket in the chain guide thingy. The LH changer flicks you
from one to the other, giving you a set of "in betweens" for the basic
hub speeds.

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:

MartinM said:

What does the LH gear changer do? just been looking at one it seems to
go to the chain guide thingy, hard to tell as it was folded up.

The Brompton 6 is actually a 2x3. The 3 is the hub and the two is a
second sprocket in the chain guide thingy. The LH changer flicks you
from one to the other, giving you a set of "in betweens" for the basic
hub speeds.

thanks but I'll have to see one working to fully understand how it
works. Presumably the folding frame affair precludes any type of
derailleur?

MartinM said:

thanks but I'll have to see one working to fully understand how it
works. Presumably the folding frame affair precludes any type of
derailleur?

Not at all, many people ride derailleur Bromptons, it's just they don't
buy them direct from Brompton because Andrew Ritchie doesn't appear to
like something so exposed as a derailleur (both to damage and spreading
crunge onto the clothes of someone carrying one). But Steve Parry will
certainly do you one, and I'm pretty sure Darth Ben has knocked up one
or two in his time.

I won't try and describe the two speed derailleur more fully 'cause
mine's a plain 3 speed, so I've only seen it briefly and from a distance.

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/

MartinM said:

Peter Clinch said:

MartinM said:

What does the LH gear changer do? just been looking at one it seems to
go to the chain guide thingy, hard to tell as it was folded up.

The Brompton 6 is actually a 2x3. The 3 is the hub and the two is a
second sprocket in the chain guide thingy. The LH changer flicks you
from one to the other, giving you a set of "in betweens" for the basic
hub speeds.

thanks but I'll have to see one working to fully understand how it
works. Presumably the folding frame affair precludes any type of
derailleur?

The two speed thing _is_ a derailleur.

Peter Clinch said:

MartinM said:

thanks but I'll have to see one working to fully understand how it
works. Presumably the folding frame affair precludes any type of
derailleur?

Not at all, many people ride derailleur Bromptons, it's just they don't
buy them direct from Brompton because Andrew Ritchie doesn't appear to
like something so exposed as a derailleur (both to damage and spreading
crunge onto the clothes of someone carrying one). But Steve Parry will
certainly do you one, and I'm pretty sure Darth Ben has knocked up one
or two in his time.

I won't try and describe the two speed derailleur more fully 'cause
mine's a plain 3 speed, so I've only seen it briefly and from a distance.

I just had another close look; there are two sprockets on the outside
of the hub gear. So you get the 6 gears but without 6 sprockets. So you
are saying that someone has managed to shoe-horn a conventional block
on there?
I can see rallies of vintage customised ones in about 50 years time, by
which time they contemporary article will be , well who knows?.

MartinM said:

I just had another close look; there are two sprockets on the outside
of the hub gear. So you get the 6 gears but without 6 sprockets. So you
are saying that someone has managed to shoe-horn a conventional block
on there?

Steve Parry does a 7 speed derailleur pretty much as an "off the shelf
hack", AIUI. He's also built a Rohloff into a Brom with some, errr,
"unconventional" modification of the rear triangle.

Quoted message said:

I can see rallies of vintage customised ones in about 50 years time, by
which time they contemporary article will be , well who knows?.

In 50 years I hope we'll have a good continuously variable transmission!

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/

MartinM said:

Peter Clinch said:

MartinM said:

thanks but I'll have to see one working to fully understand how it
works. Presumably the folding frame affair precludes any type of
derailleur?

Not at all, many people ride derailleur Bromptons, it's just they don't
buy them direct from Brompton because Andrew Ritchie doesn't appear to
like something so exposed as a derailleur (both to damage and spreading
crunge onto the clothes of someone carrying one). But Steve Parry will
certainly do you one, and I'm pretty sure Darth Ben has knocked up one
or two in his time.

I won't try and describe the two speed derailleur more fully 'cause
mine's a plain 3 speed, so I've only seen it briefly and from a distance.

I just had another close look; there are two sprockets on the outside
of the hub gear. So you get the 6 gears but without 6 sprockets.

That's right: two sprockets, three speed hub gears.

Quoted message said:

So you
are saying that someone has managed to shoe-horn a conventional block
on there?

Here's a Steve Parry one: http://www.foldsoc.co.uk/sp.html
And another: http://www.velovision.co.uk/mag/issue6/folders.pdf

Peter Clinch said:

Steve Parry does a 7 speed derailleur pretty much as an "off the shelf
hack", AIUI. He's also built a Rohloff into a Brom with some, errr,
"unconventional" modification of the rear triangle.

I suspect that needs the rider of "unless you have the titanium rear
triangle"

--
Tony

"I did make a mistake once - I thought I'd made a mistake but I hadn't"
Anon