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  1. #1
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    Front derailleur clamp size for Trek 1.5 2010

    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.

  2. #2
    More cowbell!
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    Have you tried measuring it???

    31.8mm = 1-1/4"
    34.9mm = 1-3/8"
    DFL > DNF > DNS

  3. #3
    pmt
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    Yeah, just measure it with a caliper. They have calipers at Sears for as little as $7.

  4. #4
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    Quote Originally Posted by mikeraj View Post
    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.
    34.9..

    i used to own a trek 1.2 (2010)

  5. #5
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    Re: Front derailleur clamp size for Trek 1.5 2010

    Quote Originally Posted by mikeraj View Post
    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?
    Other countries need to stop hatin' or we'll unfriend them. - Christine

    Apparently I left my reading comprehension glasses in my ass. - DrRoebuck

    Still, it felt great and I felt like I was sitting on some kind of vibrator -Touch0Gray

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