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I recently acquired an older blue Motobecane Mirage with a great frame and paint. I have stripped it all down and salvaged everything I can (frame, front wheel, handlebars, front brake) but now I'm left with a quandary.

What type of bottom bracket/crankset/rear wheel will I need?

There is something bizarre about the bike so I've read but I can't find a solid answer.

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Can you be a bit more clear about what you mean by "something bizarre"? And are you wanting to build it up with gears, single-speed, or fixed? – jimirings Sep 25 '13 at 2:35
Take it to a bike shop. Fixing bike problems over the internet is hard enough, and this question is way too sparse on details. – joelmdev Sep 25 '13 at 4:05
What exactly are you converting? What do you mean by 'older'? – WTHarper Sep 25 '13 at 5:11
@WTHarper I could imagine he means that it's a French motobecane rather than the new US brand which are produced in Taiwan – dieKleene Sep 25 '13 at 21:30
Is the issue the French bottom bracket? – mikes Sep 25 '13 at 22:02

Having converted two 70-something Motobecans, take to your best local shop to figure out what fits your bottom bracket.

As Mikes asked Is the issue the French bottom bracket? Or reverse threads?

As a last resort, Velo Orange has a bracket that will work. DO get rid go the cottered cranks!

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