Campy Nuovo Gran Sport RD capacity
Plotting to build my '79 Trek 530 with Campy GS. Traded nlerner for a nice Nuovo GS RD (thanks Neal!).
What's the largest tooth cog this will handle? I'm hoping to get the lowest gearing possible using it. I've got an Atom 77 with a 24T low , and I'm guessing that's probably the largest it can handle? I'm assuming the GS over the years had a similar capacity. If not, I can get a photo of the one I have. It's marked with an "M" ... not sure if that's a date code. |
My 1960 Gran Sport can take a 26T large cog.
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This might not help, but my '71 Nuovo Record is running a 29 tooth cog on the Continental.
http://i125.photobucket.com/albums/p...ontinental.jpg |
Originally Posted by pastorbobnlnh
This might not help, but my '71 Nuovo Record is running a 29 tooth cog on the Continental.
Thanks for the responses...the bigger the better! |
NR and nuovo gran sport are basically the same derailleur..
i've heard the largest cog they can handle is about 28/29T moving the wheel back in the dropouts is supposed to help a bit.. i've also heard of people gaining a bit of capacity by swapping the 9T jockey wheels for 11T |
yup pushing it back in the dropouts is often a necessity but I have run into this problem... if the seatstay isn't crimped and you put the axle to the back you can get chain rub (this is likely only to be and issue on late 70s bikes before they started crimping). So sometime you have to go to 5 speed if you want the 28/29 tooth... or you could spread the stay and add some spacers.
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Patrick, I'm running a Campy GS derailleur on my Raleigh Competition with a 28-tooth max rear cog. Shifts onto that cog are no problem at all, but I should add that it's a 5-speed freewheel.
Neal |
The standard accepted max capacity for that derailleur is 28t, but it can be made to work on the largest freewheel cog Regina made, a 31t, by playing with chain length and dropout position. If you had the chain length set short enough to make this work, you had to be careful how far up the freewheel you went when you were in the large chainring though. But, if you put a 50t/42t front chainrings on a Nouvo Record crankset, the Gran Sport/Nouvo Record design will work pretty smoothly on a 31t cog with a normal chain length. The closer the front chainrings get in size to each other, the smoother it will work.
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Originally Posted by skinny
The standard accepted max capacity for that derailleur is 28t, but it can be made to work on the largest freewheel cog Regina made, a 31t, by playing with chain length and dropout position. If you had the chain length set short enough to make this work, you had to be careful how far up the freewheel you went when you were in the large chainring though. But, if you put a 50t/42t front chainrings on a Nouvo Record crankset, the Gran Sport/Nouvo Record design will work pretty smoothly on a 31t cog with a normal chain length. The closer the front chainrings get in size to each other, the smoother it will work.
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Originally Posted by coelcanth
i've also heard of people gaining a bit of capacity by swapping the 9T jockey wheels for 11T
Originally Posted by cyclotoine
if the seatstay isn't crimped and you put the axle to the back you can get chain rub (this is likely only to be and issue on late 70s bikes before they started crimping). So sometime you have to go to 5 speed if you want the 28/29 tooth... or you could spread the stay and add some spacers.
I think I'll try a 28T large and see how that works. Thanks for all the help! |
Originally Posted by pastorbobnlnh
This might not help, but my '71 Nuovo Record is running a 29 tooth cog on the Continental.
-Kurt |
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