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French frame advice

Old 05-13-20, 08:21 PM
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Pars 
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French frame advice

Not being well versed in French stuff, thought I would ask.
My son bought an '84 Gitane TDF frame here from forum member Chrome Molly. We are in the process of building it up, and I ran across a question regarding FD clamp size. The seat tube measures 28mm according to my calipers. The nearest standard clamp size seems to be 28.6mm? Do you just use that? Shims needed, or tape? Nice frame at any rate!
Thanks!
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Old 05-13-20, 08:25 PM
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Here is a thread that details some useful options:

28.0 seat tube new Front Derailleur

On my Motobecane, I’ve used a small piece of inner tube for a Suntour Cyclone, but have been meaning to file the contact points as suggested in the last post in this thread.
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Old 05-13-20, 08:28 PM
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Thanks! I guess I'll try the file first.
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Old 05-13-20, 08:31 PM
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This means your bike is one of the last French metric standard bikes so figure French even metric components not a big issue for a front DR you can just buy a vintage variable hinged clamp Suntour or French DR here on the BF'd just list WTB in the sales forum or go on ebay.
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Old 05-13-20, 08:48 PM
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What I noticed is, most French component makers seem to have enough "range" in their FD clamps to accommodate both French metric and bigger 28.6 mm diameter seat tubes., so, if you go with something like a Simplex FD, you should not have any problems. I suspect Huret FDs will be equally accommodating.
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Old 05-14-20, 10:31 AM
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what I remember from my bike shop days: when installing a non-french derailleur
if it's hinged it'll need a shim. if it has a 2 bolt clamp it won't need shim.
I used to make shims for just this purpose from the inner plastic ring from a
cloth handlebar tape roll.
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Old 05-14-20, 10:37 AM
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I have owned numerous French bikes over the years and have never had an issue with the front derailleur fitting properly.
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