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Motobecane BB question

Old 04-22-05, 09:37 PM
  #1  
mswantak
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Motobecane BB question

Last weekend I picked up a mid-'70s Motobecane Mirage (don't pooh-pooh it; it was free). It has a Nervar cottered crank that's pretty rusty, and needs to be replaced. What threads does the BB have, and what other cranksets could be used as a replacement?
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Old 04-22-05, 11:06 PM
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If I recall correctly the French usta require that non-french threaded bikes be stamped BSA or ITA where they didn't meet the standard. If you see something like that on the bottom bracket, you need to match that thread standard, otherwise it'd be French. I think you could fit a lot of different cottered cranks to it. well equipped LBS probably has a couple of bushels of cottered cranks tucked back somewhere, and they should mostly be really cheap.
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Old 04-23-05, 06:15 AM
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Walter
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At different times Moto used Swiss and English threads on their export bikes. Don't know what a cottered Mirage would have but would guess French.

My relexive kick when itcomes to cotterd cranks is to upgrade to cotterless unless the bike is special.



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Old 04-23-05, 06:19 AM
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Motobecanes are often Swiss in the bottom bracket. This is French threading (35x1), but with the fixed cup having reverse threading. However, this is apparently not true of all Motos (it is of the ones I have removed the fixed cups on). Try and remove the fixed cup; this is likely the only way to tell for sure.
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Old 04-23-05, 08:03 AM
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That's part of that twisted French psyche...they switched thread directions on their fixed cups at some time and didn't provide any way to tell which way the cup turns. Does anyone know about when the switch was made? (I racked on a Gitane with an unmarked (both cups) Nervar bottom bracket once. Turned out it was BSA and reverse threaded...)
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Old 04-23-05, 10:54 AM
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Originally Posted by Walter
My relexive kick when itcomes to cotterd cranks is to upgrade to cotterless unless the bike is special.
Mine too, and no, it's not special -- it's just a Mirage, for pete's sake -- just something I picked up to refurbish and sell. I think the bike would be more saleable (not to mention several pounds lighter) with a cotterless alloy crankset, but only if I can get one for reasonably cheap.

(I racked on a Gitane with an unmarked (both cups) Nervar bottom bracket once. Turned out it was BSA and reverse threaded...)

LOL! I ran a fixed cup all the way into the wrong side once (late night, bike upside-down; don't ask).
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Old 04-23-05, 11:45 AM
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Some Swiss-threaded French bikes had a gold-coloured fixed cup. Peugeot used French threading well into the late 1970s, and finally got it right (left?) by 1980. (My 1980 PKN-10E is Swiss-threaded.) After removing the left cup, which definitely will be a 35x1 and the bearings and spindle, you may be able to see or to feel the fixed cup threads, to ascertain their parity.
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Old 04-23-05, 08:06 PM
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I built up a (went to a flat bar) Mirage Sport for an "indestructible" friend and found the bike to very rugged. I never found any info about the "tturet" dérailleurs but the rest of the group is pretty substantial for castings and stamps. I'd give any Moto a second look.
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Old 04-23-05, 08:19 PM
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There's actually markings on many bottom brackets indicating threading that are not numbers stamped on the outside of the cups. A good source for these is an older edition of Sutherland's Handbook. Look in the bottom bracket section, there are a couple of pages indicating threading markings. The various Nervar cups, for example, can be identified as to threading by markings on the bottom bracket lockring.
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Old 04-23-05, 09:01 PM
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Well, that just figures -- the lockring was missing on this one.
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Old 04-24-05, 06:44 AM
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Originally Posted by Ebbtide
I never found any info about the "tturet" dérailleurs but the rest of the group is pretty substantial for castings and stamps.
I suspect it has Huret derailleurs - which you should be able to find plenty of info on. Their attempts at using stylized lettering sometimes came out poorly.
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Old 04-25-05, 09:02 AM
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My '83 Jubile = French BB, English HS.
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Old 04-25-05, 09:05 AM
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Originally Posted by USAZorro
I suspect it has Huret derailleurs - which you should be able to find plenty of info on. Their attempts at using stylized lettering sometimes came out poorly.
Sweet, thanks for the info. I suspected something was wrong with the double "t" but that is what it looks like.
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Old 04-26-05, 05:29 PM
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Originally Posted by Ebbtide
Sweet, thanks for the info. I suspected something was wrong with the double "t" but that is what it looks like.
This site may help you ID your Huret derailleur:

http://homepage3.nifty.com/passhunte...uret/huret.htm
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Old 04-26-05, 06:57 PM
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Originally Posted by mswantak
Mine too, and no, it's not special -- it's just a Mirage, for pete's sake -- just something I picked up to refurbish and sell. I think the bike would be more saleable (not to mention several pounds lighter) with a cotterless alloy crankset, but only if I can get one for reasonably cheap.

(I racked on a Gitane with an unmarked (both cups) Nervar bottom bracket once. Turned out it was BSA and reverse threaded...)

LOL! I ran a fixed cup all the way into the wrong side once (late night, bike upside-down; don't ask).
Best spastic move that I've done lately to an upside down bike was to install the rear wheel backwards. New paint, and I was being really careful, and it took a long time to get it in there. I shoulda realized...but upside down does something to yer head...at least my head...hashed the paint a little getting it back out.
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