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  1. #1
    mtbr member
    Reputation: jasonf150's Avatar
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    Shimano slx bigger seat tube clamp for the fd

    I have a 2012 specialized hardrock disc 29er. I recently acquired SLX fd and rd and shifters. The issue is that the front derailleur has a clamp that's 25.4 (I think) but my seat tube is 30.9. I looked at google shopping but couldn't find one that looked like it matches the current one on the slx fd. Should I go to my lbs? How do I know if they make one? I'm also considering the giant talon and was going to upgrade it to these slx's also but it also uses a 30.9 seat tube.

  2. #2
    Trail Tire TV on blogger
    Reputation: thomllama's Avatar
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    ya need the proper clamp size... they used to make like 6 diff models one for each tube dia. Now I think they are down to 2 where it's too big and you buy a cheapo filler/spacer to down size. pretty much every model they make they make it what ever size is needed (or use with the filler)
    Going to try and bring Trail Tire TV back. go take a look... http://trailtiretv.blogspot.com/

  3. #3
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    Clamp-on front derailleurs come in 3 sizes and they are not the same size as your seatPOST.

    28.6mm
    31.8mm
    34.9mm

    My guess is your Specialized needs a 34.9mm clamp.

  4. #4
    Trail Tire TV on blogger
    Reputation: thomllama's Avatar
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    Quote Originally Posted by Nater View Post
    Clamp-on front derailleurs come in 3 sizes and they are not the same size as your seatPOST.

    28.6mm
    31.8mm
    34.9mm

    My guess is your Specialized needs a 34.9mm clamp.
    ya.. what he said
    Going to try and bring Trail Tire TV back. go take a look... http://trailtiretv.blogspot.com/

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