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Old 07-14-06, 01:28 PM   #1
telenick
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Campy Compact Questions

I'm in the process of the parts pick for a new bike. I know I'm going to stay with campy. I used to run 53/39 - 12/25.

I'm considering 50/36 - 11/23 for every day. Can you help me answer some questions?

Does 50/36 require the compact front derailleur that the 50/34 requires?
I thought 13/29 required a long cage rear derailleur. Is that right?
What is the step up from short/med/long cage.
Is it 11/23 - 12/25 - 13/29 respectively?

Can the 36 ring be swapped with a 34 ring without changing anything other parts?

Thanks for your input.
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Old 07-14-06, 01:42 PM   #2
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With double cranksets the short cage will handle all cassettes except possibly the 13-29. Some folks say it will work with the 13-29. Campy says you need a medium with the 13-29.

The long cage rear derailleur is for triple cranksets.

Cage length is about chainwrap capacity, not cog size.

Al
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Old 07-14-06, 02:36 PM   #3
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Quote:
Originally Posted by telenick
Does 50/36 require the compact front derailleur that the 50/34 requires?
50/34 does not require a compact front DR. I'm running my Campy 50/34 on an old Record 8-speed front DR.....and it shifts perfectly and haven't dropped the chain yet.

You can make 36 to 34 ring swaps....just remember to adjust DR height.
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Old 07-14-06, 04:59 PM   #4
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Thanks for the info. One more question.

How do you calculate chain wrap to determine rear derailleur cage length?
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Old 07-16-06, 01:36 PM   #5
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Wait till the '07 stuff comes out in October. On the cage length, go to the campy website and pull up the manuals.
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Old 07-16-06, 01:42 PM   #6
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Asked and answered:

To calculate chain wrap, subtract the sum of teeth for both the smallest chainring and sprocket from the sum of teeth for the largest chainring and sprocket.

eg. [(53 + 23) - (39 + 11)] = 26
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