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Thread: Seat Post Fit

  1. #1
    Senior Member daf1009's Avatar
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    Seat Post Fit

    Hi All...

    Needing advice here...I just got a 1962 Raleigh Gran Sport...and I am having some severe difficulty in getting the seat post back into the frame. I have measured the opening for the seat tube and the seat post itself...from the measurements, it should be a relatively good fit. Interestingly, the seat post is circularly (like a circular stair case) marked almost all the way up the post. This seems to indicate that, when disassembled, the post had to be "twisted" out...almost like screwing it out.

    I have tried to measure the seat tube opening for being egg shaped, but it does not appear to be very bad that way.

    Any advice/suggestions?
    1958 Raleigh Lenton Reg Harris Grand Prix
    1962 Raleigh Lenton Blue Streak
    1962 Raleigh Gran Sport
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    1991 Tommasso SL-56
    1992 Bridgestone RB-1
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    if it were my bike, and i am assuming the seatpost in question came out of that frame, i would just sand the post a bit until it went back in smoothly. another option would be to get the next size smaller post...

  3. #3
    Mad bike riding scientist cyccommute's Avatar
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    Quote Originally Posted by daf1009 View Post
    Hi All...

    Needing advice here...I just got a 1962 Raleigh Gran Sport...and I am having some severe difficulty in getting the seat post back into the frame. I have measured the opening for the seat tube and the seat post itself...from the measurements, it should be a relatively good fit. Interestingly, the seat post is circularly (like a circular stair case) marked almost all the way up the post. This seems to indicate that, when disassembled, the post had to be "twisted" out...almost like screwing it out.

    I have tried to measure the seat tube opening for being egg shaped, but it does not appear to be very bad that way.

    Any advice/suggestions?
    Check for a burr in the seat tube.
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    Quote Originally Posted by cyccommute View Post
    Check for a burr in the seat tube.
    +1

    specifically, feel along the inside of the slot in the back of the seat tube. This is cut with a circular saw which tends to leave burrs on the inside. You can file them out with a rat tail or triangular file, but work upside down so any filings don't fall into the frame where they can get into the crank bearings.

    Also the corners at the top of the slot sometimes get pushed in if the frame was dropped onto that end in production, so a bit of filing there often solves the problem.
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