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Front derailleur boss height

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Front derailleur boss height

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Old 03-05-18, 01:49 AM
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hams25
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Front derailleur boss height

Anybody know the standard height for a front derailleur boss from the bottom bracket center to the center of the boss? I tried finding this but can't seem to.

Any help appreciated!
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Old 03-05-18, 02:44 AM
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CliffordK
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One could probably figure it out.

What range of large chainring sizes are you designing the frame for?

46T, 48T, 50T, 52T, 54T? Range? Road vs MTB?
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Old 03-05-18, 05:07 AM
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dsaul
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Its all over the place from around 135 to the 150's depending on the large chainring size. I used a braze on with my first frame and never again. Band clamp braze on adapters are available for nearly every front derailleur and allow much more adjustment of height and rotation.
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Old 03-05-18, 06:04 AM
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busdriver1959
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Google "campagnolo interface with frame". That'll get you to their chart that gives the info based on front chainring size.
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