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Date: 21 Mar 2007 14:42:26
From:
Subject: Clamp style Deraillure Adapter - Deore Front Triple
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Hi all, I am in need of a way to use this front derailure, a Shimano
Deore FD--MT62. It is a 1 3/8 inch band clamp style and I need to put
in on a 1 1/4" seat tube (31.8mm). I have seen several adapters, but
cant find one designed to work with this DR. Tried to make one, but
that was no good. I have also tried using newer derailures, but they
are too narrow, I guess because they are for 9 speed chains and this
is a 7 speed? They either rub on the middle chain ring or on the
chain when in big gear. (THe chain rings are 24/36/46 - this is a
tandem I am building up.) Alternatively, if anyone knows for sure of
a particular FD that would work with that set up, that would be fine,
too. Finally, what is meant in the spec sheets by "total teeth
count" As in a certain DR can accomodate a 22 teeth total? Total of
what? The small ring alone exceeds 22T, so what is the total count
spec? THanks!!!
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Date: 22 Mar 2007 22:18:43
From: Tom Keats
Subject: Re: Clamp style Deraillure Adapter - Deore Front Triple
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In article <s-SdnVDHuMi8dJzbnZ2dnUVZ_tjinZ2d@ptd.net >,
"David L. Johnson" <david.johnson@lehigh.edu > writes:
> Andy wrote:
>> David, thanks for your ideas, and info on the "max jump" spec. I will
>> watch out for that. I did try the aluminum buildup method you suggest,
>> using a 2 foot strip of roof flashing that I cut into about a 1/2
>> width. The problem was not ugly, that's ok, but TWIST. The strip
>> wouldnt tighten up sfficiently so when torque was applied the der.
>> twisted on the seat post. Am I missing a trick? As for the
>> adjustment issue, it seems the new LX der. I bought cant span the
>> width required, and is also to deep (by which I mean top to bottom) so
>> that when shifted to the big ring it rubbs the middle ring - not
>> really even close to being workable. ANYONE else have a trick to
>> tighten the aluminum wraps?
>
> Cut the wrap into pieces. As it is, one long piece, the friction
> against the sides probably prevents it from tightening.
If something thicker than Coke can shims is called for, I find
a little strip of inner tube rubber often does the trick.
It's quite grippy, and doesn't scratch paint.
In my experience setting up a front derailler can be a little
tricky. What usually works for me (after acquiring one with
a long enough throw, and the right cage-curvature for the
ringset) is to mount it just high enough that the chain can't
fall off outside the big ring, and maybe toe-in the front end
of the cage a little -- almost imperceptibly. Then it's a
matter of tweaking the tension of the inner cable (by letting
the derailler fall to its normal position and then tensioning
the cable as far as one reasonably dares, after setting the
shift lever in the appropriate position) and tending to the
adjustments of the L and H screws. It can take a little
repeated trial-&-error of all those adjustments: derailler
height, angle, cable tension and adjustment screws, to get
things working oh-so-sweetly. It's almost like truing a wheel.
But it can be done. Eventually.
On a triple, when the chain goes off the middle ring to the
inner ring, it's actually momentarily flung airborne, unlike
when it gradually crawls off the middle ring to the big ring.
It's such a beautiful thing when that shift is made successfully
and smoothly.
Much of that success depends on the tension provided by
the rear derailler pulling the chain stly onto the
inner ring before the loose chain can get into any trouble.
The rest depends on good adjustments.
Interdependence is such a wonderful thing.
cheers,
Tom
--
Nothing is safe from me.
Above address is just a spam midden.
I'm really at: tkeats curlicue vcn dot bc dot ca
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Date: 21 Mar 2007 19:14:01
From: Andy
Subject: Re: Clamp style Deraillure Adapter - Deore Front Triple
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David, thanks for your ideas, and info on the "max jump" spec. I will
watch out for that. I did try the aluminum buildup method you suggest,
using a 2 foot strip of roof flashing that I cut into about a 1/2
width. The problem was not ugly, that's ok, but TWIST. The strip
wouldnt tighten up sfficiently so when torque was applied the der.
twisted on the seat post. Am I missing a trick? As for the
adjustment issue, it seems the new LX der. I bought cant span the
width required, and is also to deep (by which I mean top to bottom) so
that when shifted to the big ring it rubbs the middle ring - not
really even close to being workable. ANYONE else have a trick to
tighten the aluminum wraps?
On 21, 8:52 pm, "David L. Johnson" <david.john...@lehigh.edu >
wrote:
> AVra...@gmail.com wrote:
> > Hi all, I am in need of a way to use this front derailure, a Shimano
> > Deore FD--MT62. It is a 1 3/8 inch band clamp style and I need to put
> > in on a 1 1/4" seat tube (31.8mm).
>
> Lots of coke can shims?
>
> I have seen several adapters, but
>
> > cant find one designed to work with this DR.
>
> There actually should be a replacement clamp for this derailleur, but it
> will be far more expensive than the Coke, and will accomplish the same
> task. The coke can shims will be ugly, though.
>
> > I have also tried using newer derailures, but they
> > are too narrow, I guess because they are for 9 speed chains and this
> > is a 7 speed? They either rub on the middle chain ring or on the
> > chain when in big gear.
>
> Maybe, but this may be an adjustment issue as well.
>
> > too. Finally, what is meant in the spec sheets by "total teeth
> > count" As in a certain DR can accomodate a 22 teeth total? Total of
> > what? The small ring alone exceeds 22T, so what is the total count
> > spec?
>
> For a front derailleur, this is supposed to be the largest jump between
> big ring and smallest ring, which for you is 46-24, which is 22. You
> should be OK.
>
> --
>
> David L. Johnson
>
> "Business!" cried the Ghost. "Mankind was my business. The common
> welfare was my business; charity, mercy, forbearance, and
> benevolence, were, all, my business. The dealings of my trade were but
> a drop of water in the comprehensive ocean of my business!" --Dickens,
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Date: 21 Mar 2007 22:25:37
From: David L. Johnson
Subject: Re: Clamp style Deraillure Adapter - Deore Front Triple
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Andy wrote:
> David, thanks for your ideas, and info on the "max jump" spec. I will
> watch out for that. I did try the aluminum buildup method you suggest,
> using a 2 foot strip of roof flashing that I cut into about a 1/2
> width. The problem was not ugly, that's ok, but TWIST. The strip
> wouldnt tighten up sfficiently so when torque was applied the der.
> twisted on the seat post. Am I missing a trick? As for the
> adjustment issue, it seems the new LX der. I bought cant span the
> width required, and is also to deep (by which I mean top to bottom) so
> that when shifted to the big ring it rubbs the middle ring - not
> really even close to being workable. ANYONE else have a trick to
> tighten the aluminum wraps?
Cut the wrap into pieces. As it is, one long piece, the friction
against the sides probably prevents it from tightening.
--
David L. Johnson
"Business!" cried the Ghost. "Mankind was my business. The common
welfare was my business; charity, mercy, forbearance, and
benevolence, were, all, my business. The dealings of my trade were but
a drop of water in the comprehensive ocean of my business!" --Dickens,
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Date: 21 Mar 2007 21:52:37
From: David L. Johnson
Subject: Re: Clamp style Deraillure Adapter - Deore Front Triple
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AVrakas@gmail.com wrote:
> Hi all, I am in need of a way to use this front derailure, a Shimano
> Deore FD--MT62. It is a 1 3/8 inch band clamp style and I need to put
> in on a 1 1/4" seat tube (31.8mm).
Lots of coke can shims?
I have seen several adapters, but
> cant find one designed to work with this DR.
There actually should be a replacement clamp for this derailleur, but it
will be far more expensive than the Coke, and will accomplish the same
task. The coke can shims will be ugly, though.
> I have also tried using newer derailures, but they
> are too narrow, I guess because they are for 9 speed chains and this
> is a 7 speed? They either rub on the middle chain ring or on the
> chain when in big gear.
Maybe, but this may be an adjustment issue as well.
> too. Finally, what is meant in the spec sheets by "total teeth
> count" As in a certain DR can accomodate a 22 teeth total? Total of
> what? The small ring alone exceeds 22T, so what is the total count
> spec?
For a front derailleur, this is supposed to be the largest jump between
big ring and smallest ring, which for you is 46-24, which is 22. You
should be OK.
--
David L. Johnson
"Business!" cried the Ghost. "Mankind was my business. The common
welfare was my business; charity, mercy, forbearance, and
benevolence, were, all, my business. The dealings of my trade were but
a drop of water in the comprehensive ocean of my business!" --Dickens,
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