Motobecane questions
11-23-08, 08:19 PM
#1
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Bikes: 1975 motobecane Grand jubilee, and a rescued 1984 Raliegh Marathon, that my daughter is using at college
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Motobecane questions
I have a Grand Jubilee that I bought in 1975. It is not a "true" french bike; it will take a standard seat post and such. It has a stronglight 49 crank which is still in exceptional condition, but I was thinking about changing the chain wheel sizes and I don't think there are many different choices other than the 42/52 which I have now. Which leads to my questions. Are there any current production crank sets that will fit the stronglight squared bottom bracket? Or if I have to replace the B.B. how can I determine what the threading is on the cups?
11-23-08, 08:28 PM
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If it's a Stronglight 49D, you can have lots smaller chainwheels than 42t. If it's a mod 93, smallest you can go is 38t, I believe, and those are pretty hard to find. To confirm what you have, look up Stronglight cranksets in velobase.com.
Neal
Neal
11-23-08, 08:38 PM
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It is a 49. Here is a picture
11-23-08, 08:39 PM
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My 76 Grand Record took a square tapered Sugino Compact 50/36 crank set.
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See my Hyperlite 411 it's the photo model on OutRiderUSA web page
See my Hyperlite 411 it's the photo model on OutRiderUSA web page
11-23-08, 09:34 PM
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I think you can get a 38 from xxcycle, but it won't match vintage rings.
11-23-08, 09:48 PM
#6
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You can use either Stronglight or TA chainrings. To change the 52, you'll have to replace it with a different outer ring. They're not cheap new (www.velo-orange.com), but you can find them on eBay if you do a search for (stronglight, TA, "T.A.", "T. A", Specialites, Specialités) (49D, 49, Cyclotouriste, Pro 5) -- use the parens. Alternatively, you could get a (more common) 110 BCD crankset and matching BB to suit it. I am almost certain that your BB is French threaded, so that might present a problem. My guess is that the cheapest solution would be to fork out for the chainring you want that will fit your (extremely nice) crankset.
11-23-08, 09:55 PM
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In that case, you can use TA rings, and you can get an inner as small as 26t:
https://www.velo-orange.com/tapro5visch.html
A fairly common setup with a TA Pro Vis 5 or a Stronglight 49D is 48-50t outer ring and 34t inner ring. That range will suite most terrain.
Neal
https://www.velo-orange.com/tapro5visch.html
A fairly common setup with a TA Pro Vis 5 or a Stronglight 49D is 48-50t outer ring and 34t inner ring. That range will suite most terrain.
Neal
