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Motobecane Grand Jubile 650B conversion

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Motobecane Grand Jubile 650B conversion

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Old 09-22-16, 06:07 PM
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kroozer
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Motobecane Grand Jubile 650B conversion

Recently Iíve been trying to figure out how to ride my vintage road bikes more. Since Iím a cycle commuter most of my riding is urban, but I end up riding my mountain bike most of the time because the streets of my town are generally too rough for my narrow-tired racers and sport tourers. The most obvious solution is to put on fatter tires, although fat 700C tires often have clearance problems. I have wanted to try 650B for some time, and my 1975 Motobecane Grand Jubile seemed like a good candidate.



The hubs are Maillard 700 Professional high-flange. Rims are NOS Weinmann from Ebay France-- at $63 shipped for the pair they were a much better deal than I managed to find in the US. The 272mm spokes were just a tad short, but by using long nipples they fit well in a 3-cross pattern. The tires are some used 650Bx41 Fatty Rumpkinís.



I also tried Ebay France for vintage 650B fenders: they are abundant but generally beyond my budget, and many of them looked kind of beat up. I ended up getting a new Velo Orange aluminium set in black. They complete the look and also make this a practical commuter: itís pretty dry most of the year here but during the rainy season we get about 50 inches of rain.



The Motobecane has fairly large clearances which fit the fat tires and fenders with a few millimetres to spare on either side. I needed to trim the fenders a bit to fit the chainstay and the fork, but they mounted very securely and donít rattle at all. My Mafac Racer brakes didnít reach the rims so I replaced them with a set of Weinmann Vanqueur 750ís. The front calipers were just long enough and the rear calipers were a bit short, but by filing the slots a little they also reached.



The Jubile looks like it was made for 650B wheels, and the ride has been a pleasant surprise. The Motobecane has once again become my main daily rider, and Iím looking around at the rest of the fleet to see if I can do this again.
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Old 09-22-16, 06:16 PM
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<3
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Old 09-22-16, 06:28 PM
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came out great, and the drivetrain looks like a winner
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Old 09-22-16, 08:36 PM
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Very nice.
650b looks great on the bike.
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Old 09-22-16, 08:51 PM
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Nice drillium on the RD.
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Old 09-22-16, 08:58 PM
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Good one!! A real Jubilee with Jubilee derailleurs. That's a very clean conversion. It does look like it was meant to use 650B. I take it those are the original Weinmann 750 brake calipers?

All these conversions are tempting me. I need some sort of fat tire bike.
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Old 09-23-16, 06:53 AM
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The original brakes were indeed Weinmann Vanqueur center-pull's, but the 610 model with shorter reach. The original rims were also Weinmann's, 27".
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Old 09-23-16, 06:57 AM
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Nice conversion! When it's time for new tires you will really notice the difference between those and the 42mm Pari Moto, Compass 42 or maybe even one of the Soma offerings. But those Riv tires last a LONG time. Kind of a double-edged sword.
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Old 09-23-16, 08:18 AM
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Originally Posted by ColonelJLloyd View Post
Nice conversion! When it's time for new tires you will really notice the difference between those and the 42mm Pari Moto, Compass 42 or maybe even one of the Soma offerings. But those Riv tires last a LONG time. Kind of a double-edged sword.
+1 on 42's. I just completed a 650b conversion for a friend on that same frame, you should have room for them when your tires are ready to replace.
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Old 09-23-16, 08:48 AM
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Sweet ride, I've started doing my own conversion and it's cool to see how others have turned out.
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Old 09-23-16, 09:56 AM
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Nicely done.
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Old 09-23-16, 10:29 AM
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wow, thats pretty sharp man...neat that you went to Ebay France for a Motobecane build....I dig the old Motobecanes and yours is top notch, I bet people snap their necks to see that thing when you ride past them.. Nice !!

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Old 09-23-16, 10:34 AM
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Originally Posted by arfrhmn View Post
Very nice.
650b looks great on the bike.
+1

Almost like it was made for 650b in the first place.
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Old 09-23-16, 07:57 PM
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Well done Sir! I like that a lot

Cheers,
Chris
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