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Bicycle Mechanics Broken bottom bracket? Tacoed wheel? If you're having problems with your bicycle, or just need help fixing a flat, drop in here for the latest on bicycle mechanics & bicycle maintenance.

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Old 09-16-05, 04:41 PM   #1
uciflylow
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Bottom Braket Cartarge/ No Threads?

I bought an older Motobecane bicycle at a yard sale this past week and I have a few questions. I have read all the stuff on Seldons site and need a little advice.

I have yet to figure out exactly what kind of bottom bracket threads this bike uses, question 1, How well does those BB with no threads hold up?

How do I determine what spindle taper this BB has if I could keep the spindle and cones that are in there and just change cranks? They are in very good shape, btw I took them apart, cleaned them packed them and relubed them.

Will the friction shifter "pull" enough cable to convert this to an 8 or 9 speed. I put one of my 9 speed wheels in the rear and only spred the drops a small amount.

It has one of those Helicomatic hubs in the rear. I read there a breakdown waiting to happen. This is why I was asking about converting it to a more modern wheel set.

Should I have just gone out and had a nice lunch on that 10 bux?
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Old 09-17-05, 10:15 PM   #2
jacksbike
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If it is an older Moto then most likely it has French threaded parts, although there is a small possiblity that it has standard British threading. The BB has to have threading-there was nothing made during this time that did not, to my knowledge. Forget about changing to an 8 or 9 speed-your frame spacing is not wide enough and you would run into all kinds of chainline spacing problems. The Maillard Helicomatic hub was a nice idea during its time, but I think you would have a heck of a time trying to find any replacement parts for the hub or cassette today. I would suggest that you tune it up and clean it up, but do not put a lot of money into this. Bikes have changed so much that it is difficult to adapt a bike of this age to today's parts, spacings, and system compatibility. Sounds like computers, doesn't it ?
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Old 09-18-05, 09:53 PM   #3
uciflylow
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Thank's for the advice. I think I'll just ride it for as long as it will keep going. I just can't get over the way this bike rides. It floats over rough pavement like a majic carpet, the best I can tell it is Vitus 888 tubing by the sticker on the tube.
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