Bicycle Mechanics - Clamp-on vs braze-on FD's

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dgaddes
04-12-04, 05:55 PM
I don't seem to be able to tell one from the other. I have a shimano 105 triple fd bolted to what I now believe is a 1 3/8 oversize adapter. I think that this is supposed to be used with a braze-on fd. I mistakenly bought a 1 1/4 clamp on ultegra fd to replace it. I can't find any clamp-on's to fit my 1 3/8 seat tube. On close examination, it looks like the ultegra fd could be unbolted from its 1 1/4 clamp, and attached to the oversized clamp on my bike. Am I missing something? are both clamp-ons's and braze-on's really the same fd bolted to different brackets?

Rev.Chuck
04-12-04, 06:33 PM
There are braze on der., they have only a curved stub to fit the mount brazed(or welded) to the frame. There are also clamps that will let you mount a braze on der. to a frame, they come 1 1/8, 1 1/4, 1 3/8. If it is a braze on der there will be one bolt threaded into a curved piece that is on the right side of the der. looking at it from the drive side. This bolt will point straight to the front of the bike.
dexmax
04-12-04, 06:38 PM
I had the same problem too when I got my new frame.. My old 105 FD won't fit..
And so do all clamp-on ders at the LBS. So I was forced to order a braze-on mount and got a 105 braze-on F-der. I'll post pics later

excuse the dirt/dust and all.. just got back from my ride.. :)

dexmax
04-12-04, 06:53 PM
I had the same problem too when I got my new frame.. My old 105 FD won't fit..
And so do all clamp-on ders at the LBS. So I was forced to order a braze-on mount and got a 105 braze-on F-der. I'll post pics later

clamp on
dgaddes
04-12-04, 07:12 PM
clamp on
Thanks Dexmax. Was what I was afraid of- will have to return the clamp-on and echange it with a braze-on. Wonder if I can re-use the oversize clamp that is currently mounting my 105 fd?
dgaddes
04-12-04, 08:10 PM
There are braze on der., they have only a curved stub to fit the mount brazed(or welded) to the frame. There are also clamps that will let you mount a braze on der. to a frame, they come 1 1/8, 1 1/4, 1 3/8. If it is a braze on der there will be one bolt threaded into a curved piece that is on the right side of the der. looking at it from the drive side. This bolt will point straight to the front of the bike.

Thanks Rev. Chuck. Just arranged exchange for braze-on with oversize clamp.
BlastRadius
04-12-04, 09:37 PM
I had the same problem too when I got my new frame.. My old 105 FD won't fit..
And so do all clamp-on ders at the LBS. So I was forced to order a braze-on mount and got a 105 braze-on F-der. I'll post pics later

excuse the dirt/dust and all.. just got back from my ride.. :)

WOW! A Shark Fin, I haven't seen one of those in over a decade! :eek:
dexmax
04-13-04, 07:31 AM
WOW! A Shark Fin, I haven't seen one of those in over a decade! :eek:

haha! :D

I kept all my parts.. never sold any component...

It came with my Deore XT group... that was 1990-91? (not sure anymore) :D

I think it looks good, and serves the purpose.. ;)