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I need to replace the Shimano FD4503 Tiagra Triple front derailleur on my Trek 1.5 2010. However, I'm unsure of what the correct clamp size is: 31.8mm or 34.9mm? Thanks in advance.
 

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I need to replace the Shimano FD4503 Tiagra Triple front derailleur on my Trek 1.5 2010. However, I'm unsure of what the correct clamp size is: 31.8mm or 34.9mm? Thanks in advance.
Did you think about taking it off and looking at the inside of the clamp where the size is stamped/cast?
 
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