Front detailleur shim
06-15-12, 05:47 PM
#1
Holy crip he's a crapple
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Front detailleur shim
How should I measure this, and where can I buy one?
The bike my new front derailleur came off of used a 27.2 seatpost, and the bike I want to put it on uses a 26.4.
It's a DA FD-7700 clamp on, if that matters.
The bike my new front derailleur came off of used a 27.2 seatpost, and the bike I want to put it on uses a 26.4.
It's a DA FD-7700 clamp on, if that matters.
06-15-12, 05:56 PM
#2
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The clamp diameter should be stamped on the inside of the derailleur clamp, and is determined by the diameter of the Seat Tube, not the seat post.
There are three sizes of clamps; 28.6, 31.8, and 34.9 mm. Shims to make the larger clamp sizes work on smaller seat tubes are available, but only
to a degree.
Find out the clamp size, and someone will advise you forthwith.
There are three sizes of clamps; 28.6, 31.8, and 34.9 mm. Shims to make the larger clamp sizes work on smaller seat tubes are available, but only
to a degree.
Find out the clamp size, and someone will advise you forthwith.
06-16-12, 06:04 PM
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Front detailleur shim
Shimano derailleur? Your local shop probably has shims laying around.
06-16-12, 06:15 PM
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06-16-12, 07:28 PM
#6
Holy crip he's a crapple
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thanks for the link to universalcycles, looks like the $6 s-type 31.8 to 28.6 is what I need.
06-17-12, 06:43 AM
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06-17-12, 08:00 PM
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I hate how FD hangers aren't considered as de rigeur as RD hangers.
Clamp-on FDs look nearly as crappy as a RD claw to me.
And they create this problem.
The issue with integral FD hangers about an appropriate height can be addressed by making it a bit taller, for a start. Or by making it not really integral, like most carbon frames where it's rivetted or preferably bolted on through slotted holes.
Clamp-on FDs look nearly as crappy as a RD claw to me.
And they create this problem.
The issue with integral FD hangers about an appropriate height can be addressed by making it a bit taller, for a start. Or by making it not really integral, like most carbon frames where it's rivetted or preferably bolted on through slotted holes.
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
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Sheldon Brown's bike info ~~~ Park Tools repair help
Half-step triple, using double gear ~~~ 6400 STI rebuild walkthrough ~~~ Want 8/9/10s @126mm OLD? OCR. ~~~ Shimano cassette body overhaul ~~~ Ergopower Escape wear repair ~~~ PSA: drivetrain wear
List of US/Canada bike co-ops ~~~ Global list
Last edited by Kimmo; 06-17-12 at 08:04 PM.
06-17-12, 11:00 PM
#9
Holy crip he's a crapple
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looking at my new FD closer I've realized it's actually a braze on mounted style with a shimano braze on 31.8 adapter, so I just ordered a 'problem solvers' braze on to 28.6 FD adapter. I think that will be cleaner/lighter and easier to setup than the 31.8 with a shim.
I agree, I think a braze on of the frame is a better idea, if the FD's were slotted for height adjustment with different chainrings it would be a whole lot easier!
I agree, I think a braze on of the frame is a better idea, if the FD's were slotted for height adjustment with different chainrings it would be a whole lot easier!
