Seatpost minimum insertion for this frame
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  1. #1
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    Seatpost minimum insertion for this frame

    What would be the safe minimum insertion for this frame?
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  2. #2
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    This is usually determined by the seatpost, which should have a minimum insert mark on it.

  3. #3
    Never Give Up!
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    The seat post dictates the minimum height, not the frame!
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  4. #4
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    I thought the seatpost usually uses caution since there are many different frames.

    With the master frame the tubing goes into a star shape and you can't even get some of the posts to the minium. I think the star shape starts before the 10cm mark (a lot of the seatpost minimum)

  5. #5
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    Quote Originally Posted by Ddbigs View Post
    I thought the seatpost usually uses caution since there are many different frames.

    With the master frame the tubing goes into a star shape and you can't even get some of the posts to the minium. I think the star shape starts before the 10cm mark (a lot of the seatpost minimum)
    On my Master, the "star" shape starts about 6" down from the top of the lug. I'm using a Ritchey Classic post and I have plenty of post past the min insertion

  6. #6
    'brifter' is f'ing stupid
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    In the old days the 'general' rule was 2.5 x the diameter of the post. In the case of a frame like this w/ a 27.2mm post that would be 68mm. Obviously it should be marked on the post.
    If you can't get the post to the min mark there's something wrong w/ the frame...paint or something. It needs to be reamed/cleaned out.
    #promechaniclife

  7. #7
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    Quote Originally Posted by DaveG View Post
    On my Master, the "star" shape starts about 6" down from the top of the lug. I'm using a Ritchey Classic post and I have plenty of post past the min insertion
    Maybe it's different sizing or different generation? This one definitely doesn't have that much room. Roughly 9cm. I was hoping to go even less as you I don't want to damage the tube if the seatpost slips a little

  8. #8
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    Quote Originally Posted by Ddbigs View Post
    Maybe it's different sizing or different generation? This one definitely doesn't have that much room. Roughly 9cm. I was hoping to go even less as you I don't want to damage the tube if the seatpost slips a little
    My frame is a 61 (c-t) so maybe less room on a smaller frame? What post do you plan to use?

  9. #9
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    Thinking of using Deda zero 100 aluminum post

  10. #10
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    Quote Originally Posted by Ddbigs View Post
    Thinking of using Deda zero 100 aluminum post
    From a photo of that post at Excel Sports it looks to me that the min insertion line is about 9.5 cm from the bottom. But, that is a super long post and you won't have as much exposed seatpost.

  11. #11
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    You guys should use the same units, 68mm is way less than 9cm.
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  12. #12
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    Quote Originally Posted by duriel View Post
    You guys should use the same units, 68mm is way less than 9cm.
    You're right. That's like almost an inch difference!

  13. #13
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    Quote Originally Posted by jetdog9 View Post
    This is usually determined by the seatpost, which should have a minimum insert mark on it.
    Yes. After all, there is somebody out there who makes seatposts for clown bikes....
    "L'enfer, c'est les autres"

  14. #14
    pmf
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    Quote Originally Posted by DaveG View Post
    On my Master, the "star" shape starts about 6" down from the top of the lug. I'm using a Ritchey Classic post and I have plenty of post past the min insertion
    Exact same story on my Arabesque. Any standard 27.2 seat post should work just fine.

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