Seat tube reamer?- Mtbr.com
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  1. #1
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    Seat tube reamer?

    I want to install a dropper post in my frame but the seat tube insertion depth is not enough. I only need to ream about 19mm @ which point, in the seat tube, is a minute step. I don't know if an adjustable reamer :

    https://www.jensonusa.com/Chadwick-A...iABEgJ48fD_BwE


    Or fixed :

    https://www.bike24.com/1.php?content...7C%7C%7C%7C%7C

  2. #2
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    What about a shorter dropper?

  3. #3
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    What size? I have a 30.9 setup for sale.

  4. #4
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    Quote Originally Posted by Mr Pig View Post
    What about a shorter dropper?
    I am 6'5" tall and need the largest dropper available - 200mm.

  5. #5
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    Quote Originally Posted by Black Squirrel View Post
    What size? I have a 30.9 setup for sale.
    Need a 31.6mm. Thanks.

  6. #6
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    Quote Originally Posted by keen View Post
    Need a 31.6mm. Thanks.
    If you fit a 30.9 and a shim you might not need to alter the frame.

  7. #7
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    Quote Originally Posted by Mr Pig View Post
    If you fit a 30.9 and a shim you might not need to alter the frame.
    I am currently running a shimmed Thomson post and get creaking. Not sure if having the dropper greased, @ the insertion, would eliminate the noise but it would still have movement. Before I shimmed my current setup reviews for shims were a bit mixed.

  8. #8
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    Quote Originally Posted by keen View Post
    I want to install a dropper post in my frame but the seat tube insertion depth is not enough. I only need to ream about 19mm @ which point, in the seat tube, is a minute step. I don't know if an adjustable reamer :

    https://www.jensonusa.com/Chadwick-A...iABEgJ48fD_BwE


    Or fixed :

    https://www.bike24.com/1.php?content...7C%7C%7C%7C%7C




    The first linked tool isn't the correct size, the second is handles, you'll also need the proper size reamer. I'm with the poster that suggested a shim.
    "These things are very fancy commuter bikes or really bad dirt bikes, but they are not mountain bikes." - J. Mac

  9. #9
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    Just add a handle. https://www.ebay.com/itm/1-244-Carbi...4AAOSwzaJYBpkL

    Or, if you don't want to mess around, Joe Bringheli sells the best reamers.
    NOTHING WORKS LIKE CLOCKWORK

    www.clockworkbikes.com

  10. #10
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    Quote Originally Posted by keen View Post
    I am currently running a shimmed Thomson post and get creaking.
    Creaking has nothing to do with the size of the post or whether or not a shim is used. In fact I would suspect that the noise is coming from the saddle area, not the lower part of the post.

    There isn't any reason why a shim shouldn't work fine. I've used them a couple of times with no issues, although I do seek out 100mm ones rather than the more common 80mm, just because. Most frames only support the seat-post over that sort of area so seat-posts, dropper or not, will have to be designed with that in mind. I would definitely just use a shim rather than starting to remove metal from my seat-tube. No question.

  11. #11
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    I decided to dig a little into the creaking noise. It is in-fact the post to frame area was causing the creak but not where I would have guessed. I thought the shim might be slighting rocking during seated climbing but one shot of silicone on the post (then re-inserted) and it was creak free. The post is a Thomson 27.2 w/ a Cane Creek 27.2 / 31.6 shim. I only used the skinny post as that was what I had from an old Turner frame.

  12. #12
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    You should grease the post anyway, or use assembly paste if it's a carbon one.

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