French threaded--derailleur claw?
03-22-11, 12:27 PM
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French threaded--derailleur claw?
When you attach a derailleur claw to a dropout that lacks an integral hanger, it's held on by a little bolt that goes through a hole in the claw--just behind the slot for the axle--and threads into a special nut with a round shoulder that fits the slot in the dropout, yes? (Of course, once the wheel is in place it's also held there by the axle and the pressure of the quick release.) As far as I've ever known, both the bolt and the special nut have conventional 5 mm threading.
Today I went to attach a Huret dropout to a Peugeot I'm working on, which has thick forged Simplex dropouts, rather than the thinner stamped ones that more often use a claw. Consequence was the bolt was too short--would only thread about a couple of turns into the nut.
"No problem," thinks I, and obtains a longer M5 bolt from the local hardware store. Come to find out the Huret nut/bolt apparently doesn't use standard threading--the M5 bolt threads into the nut five or six turns, then jams up. I solved the immediate problem by stealing a different nut--which DOES have conventional M5 threads--from one of my collection of priceless Campy Valentino derailleurs and mating it with the new hardware-store bolt and the Huret claw.
But still, I have to wonder about this whole French business. I mean, I've been working on French bikes for years, and thought I knew my way around them reasonably well. Now I find out that Huret had their own proprietary derailleur mounting claw nut threading? What next?
Today I went to attach a Huret dropout to a Peugeot I'm working on, which has thick forged Simplex dropouts, rather than the thinner stamped ones that more often use a claw. Consequence was the bolt was too short--would only thread about a couple of turns into the nut.
"No problem," thinks I, and obtains a longer M5 bolt from the local hardware store. Come to find out the Huret nut/bolt apparently doesn't use standard threading--the M5 bolt threads into the nut five or six turns, then jams up. I solved the immediate problem by stealing a different nut--which DOES have conventional M5 threads--from one of my collection of priceless Campy Valentino derailleurs and mating it with the new hardware-store bolt and the Huret claw.
But still, I have to wonder about this whole French business. I mean, I've been working on French bikes for years, and thought I knew my way around them reasonably well. Now I find out that Huret had their own proprietary derailleur mounting claw nut threading? What next?
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03-22-11, 02:34 PM
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Ah yes, it's ringing a faint distant bell of memory: something about a fine-pitch threading that's almost never used anywhere on anything...even in France. But it is metric (doesn't help, does it?)
03-22-11, 02:42 PM
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Have you run across the French threaded spoke nipple issue yet?
I see that there is a 5x0.75 size in tap-land. Just enough to mess up a standard 5x0.8 nut/bolt
I see that there is a 5x0.75 size in tap-land. Just enough to mess up a standard 5x0.8 nut/bolt
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Last edited by Ex Pres; 03-22-11 at 02:49 PM.
03-22-11, 03:15 PM
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That would be it, I suppose. At least there's an easy and not-too-inelegant workaround.
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03-22-11, 05:56 PM
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measure first: I wouldn't trust my memory...seeing as how the Huret dropout adjuster threading is coarser (not finer) than standard it might be that this is a coarse-threaded example, too.
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