Here's a link to some picture that I posted a while back that show the different Huret washers for mounting on their proprietary dropouts and Campy style dropouts.
http://www.flickr.com/
Click on the pictures to enlarge and get explanations.
Chas. Colerich Oakland, CA USA
Ken Freeman wrote:
> The design does not involve an upper pivot spring, so that's why you're not
> finding one. It's sup
>
> The ones I have come with a captive Allen-head bolt and a washer on the
> frame side. The washer has a tab that is bent toward the bike. There are
> two designs of this washer: one for French frames, and one for all other
> frames. The one for "all other" fits Campy and Shimano steel dropouts
> perfectly. With this matched up right the parallelogram sits at an angle
> about 30 degrees ahead of vertical. The cage angle is then a result of the
> gear selected and of chain length. I can always pull it backwards to allow
> the wheel to release from the frame.
>
> Your Motobecane could have the French derailleur tab design or the Campy one
> - Moto seemed less devoted to French sizings than some other French makers.
> But the tire deflation issue: I think that's just that the chainstays are
> considerably shorter than on some of your other frames, and perhaps your
> tires are too big for the frame? I'm using Duopars right now on a 1984 Trek
> 610 with 43 cm chainstays and a 1980 Woodrup with 44 cm. Both are a little
> shorter than your Trek 720, and I would just be guessing on your Schwinn's
> dimensions, but few frames have longer chainstays than a Trek 720. On my
> two bikes I have no issue with wheel extraction while the tire is inflated.
>
> It could also be that Moto made long chainstays, but mounted the chainstay
> bridge too far from the bottom bracket, artificially constraining the wheel
> extraction clearance.
>
> On Mon, Jun 7, 2010 at 12:02 PM, Calvert Guthrie
> <calvertguthrie@gmail.com>wrote:
>
>> What's with the main parallelogram frame attachment bolt?
>> There's no coil spring & it doesn't swing back
>> to allow the spindle in and out of the dropouts.
>>
>> I got around it on my long Trek 720 and my Schwinn Voyageur ('84 touring)
>>
>> I shifts perfectly on my somewhat shorter-stayed, triple, Motobecane Grand
>> Touring
>> but the tire needs to be airless to get the wheel on and off.
>> I'm working toward a finesse but at this point it is still a fight.
>>
>> Fancier spindle nuts with bails, &c. make it particularly awkward.
>>
>> Is there a retro-fit option that'll get me beyond this burr?
>>
>> Or should I just get used to it?
>>
>> --
>> Calvert "Where's My Hammer!" Guthrie
>> Rector Director
>> KC Center for the Ink & Paper Arts
>> 1427 West 9th Street, Kansas City
>> Missouri 64101 USA