It's my understanding that modern front derailleurs have relatively wide
cages to allow for a greater range of chain angles without rubbing the
chain, which leads to clearance issues with older, narrow-Q cranks.
Perhaps using a vintage derailleur of some kind might help?
-jeremy
On Monday,
Jeremy is right. You could try to squish the outer cage of your FD or get
one that has a flatter outer cage to start with. Old front derailers are a
dime a dozen, so you should be able to try lots of things on the cheap. My
mid 80s Stumpjumper has a Deore deer head front der and that same
The test case for such a narrow gap is the old TA Pro 5 Vis -- I hear that
the new ones have a wider gap. I have an old one on the Ram and use an old
7400 Dura Ace FD, which works fine. The downside, such as it is, is that,
at least with the small gap on the TA, it requires great precision in fd
I'm running a Velo Orange Grand Cru 50.4BCD crankset with a single chainring
(http://store.velo-orange.com/index.php/components/cranksets/grand-cru-50-4bcd-crankset-mkii.html)
on my Quickbeam, and I'm at a loss to see how it would work if there was a
derailleur in the mix. Even an old-style
Patrick, guess I got lucky with my Cyclotouriste. Never had a hitch with
it, with a Shimano 600EX FD. I did have to change my bottom bracket to get
the chainline (to get the escape gear to clear the chainstay), and I used
the SK 126mm. Everything dialed right in on the first try, and never
I was able to run the FD really snug, with half step chainrings, 46/41,
which was a nice combination on a 6-speed rear.
The thin TA 144 bcd chainrings added significant gap.
http://img.photobucket.com/albums/v728/bulldog1935/Raleigh/aPC310011_zpse51abc77.jpg
My daughter is about to build up
My setup is made easier because I am running only 7 cogs with spacers at
front and back. (Segue: with a spacer just behind the lockring, you can use
any size cog as the outer. I plan to build a 18-20-22-24-27-30-34 six
speed to use with a 53 t inner. Just kidding, but the 14-23 is great.) Even
It's satisfactory now and, frankly, even tho' my gears (44/30 X
14-15-16-17-18-20-23) give me between 85 and 35, most of my riding is in
the middle cogs (60-64-70-74 is such a lovely progression), so chain rub is
far less of even a potential issue. Putting 10 cogs on would definitely
make
part of it is the 173mm Raleigh BB housing. But yes, I put half steps with
escape 47/42/26 - again, with 13-27 rear. My daughter and I were climbing
9-degree switchbacks a few weeks ago, and and both 26 gears which were
very handy.
On Monday, June 3, 2013 6:23:33 PM UTC-5, Patrick Moore
The VO 50.4 MK1 is a tight fit, which is apparently why they came out with
the MK2. I'm currently running my MK1, in 28/48, with the Microshift
braze-on FD. Was running it with an old Suntour vX. Tolerance with both
is tight - a few ratchet clicks either way - but the Microshift is holding
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