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Old 09-05-08, 04:03 PM   #1
JoelS
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Chainring Compatibility Question

I have a late 90's issue Campy Chorus 9 equipped bike. The crank is set up with 51/39 chainrings. Is it possible to put some slightly smaller rings (like 49/37) on without switching out for a compact? If so, what sizes will work?

Thanks in advance.
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Old 09-05-08, 04:06 PM   #2
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Originally Posted by JoelS View Post
I have a late 90's issue Campy Chorus 9 equipped bike. The crank is set up with 51/39 chainrings. Is it possible to put some slightly smaller rings (like 49/37) on without switching out for a compact? If so, what sizes will work?

Thanks in advance.
Here's how you measure the bolt circle diameter. Measure yours and then go nuts with someone like BikeMan (they have a pretty good selection).
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Old 09-05-08, 04:32 PM   #3
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Thanks. Looks like I can go down to a 38. If I couple that with a 13/26, I'll be in better hill shape than I am now (12/23).
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