1977 Motobecane Grand Record bottom bracket: Is it French threads
02-22-16, 03:44 PM
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1977 Motobecane Grand Record bottom bracket: Is it French threads
What are the odds my 1977 Motobecane Grand Record has a French threaded bottom bracket? 100% or not?
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02-22-16, 04:00 PM
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My 78 Moto is a Swiss BB, many Motobecanes use it
02-22-16, 04:13 PM
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You might be able to tell by removing the left cup and peeking across at the threads.
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02-22-16, 04:24 PM
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I'd like to determine whats needed before tearing it all down.
The cost of a Swiss compatible bottom bracket might kill the crank update project I was considering.
The cost of a Swiss compatible bottom bracket might kill the crank update project I was considering.
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When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
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Last edited by Barrettscv; 02-22-16 at 05:00 PM.
02-22-16, 05:40 PM
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my '76 g.record is swiss.
so ... that's a bb with french threads (just like its steerer tube) but the fixed cup is reverse (left hand) threaded like an english bb.
so ... that's a bb with french threads (just like its steerer tube) but the fixed cup is reverse (left hand) threaded like an english bb.
02-22-16, 06:10 PM
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If it has has the OEM TA crankset and bottom bracket, French cups have a single ring engraved around the spindle hole. English cups have two rings, while Italian cups have no rings. If the fixed cup is Swiss it will have the single ring plus a 'G' stamp.
02-22-16, 08:58 PM
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02-22-16, 09:20 PM
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...
...every Moto GR I've run into here (five total) from about that era have been French threaded. Which, sadly, tells you nothing.
...every Moto GR I've run into here (five total) from about that era have been French threaded. Which, sadly, tells you nothing.
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02-22-16, 09:49 PM
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If all else fails, you can always try the Sheldon Brown method. It worked for me once: Turn the fixed cup clockwise, pretty hard. If nothing happens, turn it clockwise a little harder. If nothing still happens, turn it clockwise even harder. If nothing still happens, turn it counterclockwise harder yet. And so on. This is a shamelessly empirical approach, but eventually the cup will tell you which way it wants to go.
This is a lot easier if you have a good torque wrench, so you can be sure you are in fact turning it harder with each change of direction.
Good luck!
This is a lot easier if you have a good torque wrench, so you can be sure you are in fact turning it harder with each change of direction.
Good luck!
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02-24-16, 12:48 PM
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I'm 99% sure the BB is Swiss, based on the details and opinions provided. I'll keep the original BB and crankset on the bike. I was going to install a VO Grand Cru 50.4 crank, but the total cost of the conversion is more than $270.
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When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
When I ride my bike I feel free and happy and strong. I'm liberated from the usual nonsense of day to day life. Solid, dependable, silent, my bike is my horse, my fighter jet, my island, my friend. Together we will conquer that hill and thereafter the world.
02-24-16, 03:36 PM
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My 77 GR has a 1.27x24t adjustable side cup, the locking side im not sure, I'll need to check, the cup says T P A FG
02-25-16, 03:37 PM
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