Join Date: Jun 2004
Location: Northern Nevada
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Ir's certainly a MOTOBECANE, and in the '80s they were fine--my first serious bike was a Motobecane Gran Jubilee, a lugged steel frame with Campy components. I did my first century on it and a lot of riding for five or six years until I destroyed it in a crash. I have an Atlantis and Rambouillet now, but I still think back fondly to the Moto.
If it's really a TEN-speed, and you're not just using that to mean "standard road bike," then it will date from about the mid-'80s or earlier. I can't remember when the world changed from five- to six-speed freewheels, but seems to me it was about then. May also have Maillard Helicomatic hubs and freewheel, which have been out of production and are really hard to get parts for now.
I have no idea what's going on with Motobecane now. I don't think I've seen a new one in several years, but I don't pay much attention, so I could be wrong. If it's an older bike, it will probably have French parts, which didn't fit anything else in the world. The BB threading was different, for instance, and the stem diameter was 22.0 mm at a time when everyone else in the world used 22.2, so you couldn't interchange them. As somebody else suggested, Sheldon Brown will have more information.