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  1. #1
    Sir Crashalot Airborne's Avatar
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    front derailleur clamp size?

    Question: I am replacing the front deraileur on my 2002 Giant Iguana frame with a Shimano LX drlr. I am unsure of the clamp size as it comes in 3 different ones: 28.6 mm, 31.8 mm, and 34.9 mm. I have a 31 mm seatpost, and thats all the info i have. there is no info from the giant homepage, and my lbs (over the phone) didnt know, but guessed 31.8. i think it would be 34.9 with that size seatpost though yes? anyone with any info i'd appreciate it!
    keep the rubber side down!

  2. #2
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    At another forum I frequent there is a member that works at Giant. I'll contact him and ask for you. Give me a little while to hear back from him.

    In the meantime, rule out the 28.6 that's generally used on older thin diameter steel frames.

    You could also just measure the thing if you've got a venier caliper. If not, wait a little and I'll try to find out!

    L8R
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
    "Your Bike Sucks" - Sky Yaeger

  3. #3
    NCAA - DUAL CHAMPIONS! a2psyklnut's Avatar
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    Duh,

    Take the existing one off your bike. The size should be stamped on the inside of the clamp!

    L8R
    "Life is not a journey to the grave with the intention of arriving safely in a pretty and well preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming, "WOW, What a Ride!" - unknown
    "Your Bike Sucks" - Sky Yaeger

  4. #4
    Senior Member
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    Originally posted by a2psyklnut
    Duh,

    Take the existing one off your bike. The size should be stamped on the inside of the clamp!

    L8R
    That works,as well as measuring the diamerer, or the circumference and doing the math.

  5. #5
    I ride a REAL Schwinn!
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    Airborne,

    Check out the Giant site. There is a link to see the Iguana's geometry as your looking at the general info for it. I believe it gives the diameter of the seat tube in millimeters. As long as this is the measurement at the front derrailleur clamp, you should be able to figure it out with this.

    -Moab
    '00 Schwinn Moab 3 - XTR/XT/Thomson/Rhyno Lites/Skareb Super
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  6. #6
    Sir Crashalot Airborne's Avatar
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    Originally posted by moabrider47
    Airborne,

    Check out the Giant site. There is a link to see the Iguana's geometry as your looking at the general info for it. I believe it gives the diameter of the seat tube in millimeters. As long as this is the measurement at the front derrailleur clamp, you should be able to figure it out with this.

    -Moab
    thanks, but as i stated, nothing is on the site.
    keep the rubber side down!

  7. #7
    Donating member Richard D's Avatar
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    I haven't an Iguana, but my Giant has a 30.8 seatpost and uses the 34.9 clamp so probably...

    Richard
    Currently riding an MTB with a split personality - commuting, touring, riding for the sake of riding, on or off road :)

  8. #8
    Dances with Rocks Dirtgrinder's Avatar
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    This if from Sheldon Brown's site:

    1 1/8" (28.6 mm) clamp on. (This is the traditional, standard type for most road bikes and older MTBs.
    1 1/4" (31.8 mm) clamp on for mildly oversized seat tubes.
    1 3/8" (34.9 mm) clamp on for oversized seat tubes, common on aluminum frames.

    Just replaced mine on a Giant XTC NRS 2. It was 34.9.
    If everything seems under control, you're just not going fast enough...

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  9. #9
    Sir Crashalot Airborne's Avatar
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    thanks richard and dirt... that is very halpful and sounds on the money!
    keep the rubber side down!

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