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Seat tube reaming question

Started by CEarly · · Last activity · 12 posts · 534 views

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Cycling Equipment
Published
3 March 2005
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4 March 2005
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CEarly
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  1. I recently got a new Gunnar Rockhound mtb frame that accepts a 27.2mm
    seatpost. The seat tube was reamed in the top 10cm only. I can't insert a
    seatpost any deeper than 10cm, which is only about 2.5cm more than the min
    insertion depth of the Thomson seatpost I have for this frame. The seatpost
    hits a small ledge inside the seat tube where the reaming stopped. Is this
    typical, or a manufacturing defect? Seems like very little height
    adjustability on a mtb frame to me. How could this be rectified so I could
    get more seat height adjustment on this frame? Yes, I'm asking Gunnar about
    this, but thought it might be worthwhile to hear disinterested opinions as
    well.

    Cal

  2. On Wed, 2 Mar 2005 18:44:05 -0800, "CEarly" <[email hidden]> may have

    Quoted message said:

    I recently got a new Gunnar Rockhound mtb frame that accepts a 27.2mm
    seatpost. The seat tube was reamed in the top 10cm only. I can't insert a
    seatpost any deeper than 10cm, which is only about 2.5cm more than the min
    insertion depth of the Thomson seatpost I have for this frame. The seatpost
    hits a small ledge inside the seat tube where the reaming stopped. Is this
    typical, or a manufacturing defect? Seems like very little height
    adjustability on a mtb frame to me. How could this be rectified so I could
    get more seat height adjustment on this frame? Yes, I'm asking Gunnar about
    this, but thought it might be worthwhile to hear disinterested opinions as
    well.

    By any chance, does the seat post stop at about the same place where
    the ferrule is welded on for the front der shift cable?

    --
    My email address is antispammed; pull WEEDS if replying via e-mail.
    Typoes are not a bug, they're a feature.
    Words processed in a facility that contains nuts.

  3. CEarly said:

    I recently got a new Gunnar Rockhound mtb frame that accepts a 27.2mm
    seatpost. The seat tube was reamed in the top 10cm only. I can't insert a
    seatpost any deeper than 10cm, which is only about 2.5cm more than the min
    insertion depth of the Thomson seatpost I have for this frame. The seatpost
    hits a small ledge inside the seat tube where the reaming stopped. Is this
    typical, or a manufacturing defect? Seems like very little height
    adjustability on a mtb frame to me. How could this be rectified so I could
    get more seat height adjustment on this frame? Yes, I'm asking Gunnar about
    this, but thought it might be worthwhile to hear disinterested opinions as
    well.

    A common practice among modern bike builders.
    Either pass a reamer through deeper or cut off the excess
    post and mark a new "max height" line 60mm from the cut.

    --
    Andrew Muzi
    www.yellowjersey.org
    Open every day since 1 April, 1971

  4. "Werehatrack" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:

    On Wed, 2 Mar 2005 18:44:05 -0800, "CEarly" <[email hidden]> may have

    Quoted message said:

    I recently got a new Gunnar Rockhound mtb frame that accepts a 27.2mm
    seatpost. The seat tube was reamed in the top 10cm only. I can't insert
    a
    seatpost any deeper than 10cm, which is only about 2.5cm more than the min
    insertion depth of the Thomson seatpost I have for this frame. The
    seatpost
    hits a small ledge inside the seat tube where the reaming stopped. Is
    this
    typical, or a manufacturing defect? Seems like very little height
    adjustability on a mtb frame to me. How could this be rectified so I
    could
    get more seat height adjustment on this frame? Yes, I'm asking Gunnar
    about
    this, but thought it might be worthwhile to hear disinterested opinions as
    well.

    By any chance, does the seat post stop at about the same place where
    the ferrule is welded on for the front der shift cable?

    --
    My email address is antispammed; pull WEEDS if replying via e-mail.
    Typoes are not a bug, they're a feature.
    Words processed in a facility that contains nuts.

    Nope, it clearly stops right where the small ledge has been created at the
    10cm depth the seat tube was reamed to. The ferrule welded on the back of
    the seat tube is about another cm below that and there are no irregularities
    visible inside the seat tube until the upper water bottle screw comes
    through, about 23 cm below the top of the seat tube.

    Cal

  5. "A Muzi" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:
    CEarly said:

    I recently got a new Gunnar Rockhound mtb frame that accepts a 27.2mm
    seatpost. The seat tube was reamed in the top 10cm only. I can't insert
    a seatpost any deeper than 10cm, which is only about 2.5cm more than the
    min insertion depth of the Thomson seatpost I have for this frame. The
    seatpost hits a small ledge inside the seat tube where the reaming
    stopped. Is this typical, or a manufacturing defect? Seems like very
    little height adjustability on a mtb frame to me. How could this be
    rectified so I could get more seat height adjustment on this frame? Yes,
    I'm asking Gunnar about this, but thought it might be worthwhile to hear
    disinterested opinions as well.

    A common practice among modern bike builders.
    Either pass a reamer through deeper or cut off the excess post and mark a
    new "max height" line 60mm from the cut.

    --
    Andrew Muzi
    www.yellowjersey.org
    Open every day since 1 April, 1971

    Thanks for the observation that this is common. I've never encountered it
    on other frames I've had though. I neglected to mention that the internal
    ledge at 10cm in the seat tube is just on one side, indicating that the
    reamer was misaligned in the tube. I'm guessing that whoever was doing the
    work realized that and stopped before irreparably damaging the frame, which
    is why I'm only able to insert a seatpost to 10cm. So, if I want a low seat
    position for DH, it looks like I'll get to haul a shorter seatpost around
    with me. Guess I'll chalk this up to experience and reject a frame with
    this problem immediately in the future, not to mention avoiding Gunnar. Too
    bad their QC missed this. With the misaligned reaming job so far, trying to
    ream it deeper would seem to risk perforating or seriously weakening the
    seat tube.

    Cal

  6. Reaming deeper is no problem, but call 'em, they'll make it right.

  7. Yeah, just do it by hand instead of a milling machine. It should mill
    deeper and accept the post just fine.

  8. Isn't reaming a "bike shop" thing ?
    Since Waterford doesn't sell direct, you had to buy this bike from a
    bike shop. You would think that any bike shop worth it's salt would
    ream out the seat tube and check the BB threads. Same for preping the
    frame for a headset.

  9. heh heh.... you said "ream"

  10. CEarly said:

    Thanks for the observation that this is common. I've never
    encountered it on other frames I've had though. I neglected to
    mention that the internal ledge at 10cm in the seat tube is just on
    one side, indicating that the reamer was misaligned in the tube.
    I'm guessing that whoever was doing the work realized that and
    stopped before irreparably damaging the frame, which is why I'm only
    able to insert a seatpost to 10cm. So, if I want a low seat
    position for DH, it looks like I'll get to haul a shorter seatpost
    around with me. Guess I'll chalk this up to experience and reject a
    frame with this problem immediately in the future, not to mention
    avoiding Gunnar. Too bad their QC missed this. With the misaligned
    reaming job so far, trying to ream it deeper would seem to risk
    perforating or seriously weakening the seat tube.

    Ummm, maybe this is a weird question, but have you called Gunnar and
    talked to them about this? I have found them ("them" being Waterford
    precision Bicycles, the owner and manufacturer of Gunnar- Gunnar being
    named after Richard Schwinn's dog, IIRC) to be very helpful and to
    provide excellent customer service. Rather than just grousing about
    them, perhaps you might see if they would be willing to make it right.

  11. "Tim McNamara" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:
    CEarly said:

    Thanks for the observation that this is common. I've never
    encountered it on other frames I've had though. I neglected to
    mention that the internal ledge at 10cm in the seat tube is just on
    one side, indicating that the reamer was misaligned in the tube.
    I'm guessing that whoever was doing the work realized that and
    stopped before irreparably damaging the frame, which is why I'm only
    able to insert a seatpost to 10cm. So, if I want a low seat
    position for DH, it looks like I'll get to haul a shorter seatpost
    around with me. Guess I'll chalk this up to experience and reject a
    frame with this problem immediately in the future, not to mention
    avoiding Gunnar. Too bad their QC missed this. With the misaligned
    reaming job so far, trying to ream it deeper would seem to risk
    perforating or seriously weakening the seat tube.

    Ummm, maybe this is a weird question, but have you called Gunnar and
    talked to them about this? I have found them ("them" being Waterford
    precision Bicycles, the owner and manufacturer of Gunnar- Gunnar being
    named after Richard Schwinn's dog, IIRC) to be very helpful and to
    provide excellent customer service. Rather than just grousing about
    them, perhaps you might see if they would be willing to make it right.

    Why, yes, I've contacted Waterford Precision Bicycles (Boy, it was tough
    resisting that one!), as I mentioned earlier in this thread, explaining what
    problem was. Today, I was offered the opportunity to send the frame back to
    them. Problem is, they're in WI and I'm in WA. I'm not real thrilled about
    the increased potential for damage to the frame inherent in two more
    cross-country trips with shipping companies, not to mention having to pay to
    send it there. So, I've counter-offered to take the frame to a local bike
    shop and get the re-reaming done and send the bill to Waterford for
    reimbursement. I'll see what they think about that idea tomorrow.

    At least I know from their reply that Waterford thinks it's okay to
    re-ream the seat tube to correct this problem. I don't know how thin the
    walls of those tubes are, nor what the potential weakening effect of taking
    more metal off in the process of trying to straighten out the reaming would
    be, but I'm relieved to hear that this may be correctable.

    I'll let you know how "excellent" their customer service turns out to be.

    Cal

  12. CEarly said:

    "Tim McNamara" <[email hidden]> wrote in message
    news:[email hidden]...

    Quoted message said:
    CEarly said:

    Thanks for the observation that this is common. I've never
    encountered it on other frames I've had though. I neglected to
    mention that the internal ledge at 10cm in the seat tube is just
    on one side, indicating that the reamer was misaligned in the
    tube. I'm guessing that whoever was doing the work realized that
    and stopped before irreparably damaging the frame, which is why
    I'm only able to insert a seatpost to 10cm. So, if I want a low
    seat position for DH, it looks like I'll get to haul a shorter
    seatpost around with me. Guess I'll chalk this up to experience
    and reject a frame with this problem immediately in the future,
    not to mention avoiding Gunnar. Too bad their QC missed this.
    With the misaligned reaming job so far, trying to ream it deeper
    would seem to risk perforating or seriously weakening the seat
    tube.

    Ummm, maybe this is a weird question, but have you called Gunnar
    and talked to them about this? I have found them ("them" being
    Waterford precision Bicycles, the owner and manufacturer of Gunnar-
    Gunnar being named after Richard Schwinn's dog, IIRC) to be very
    helpful and to provide excellent customer service. Rather than
    just grousing about them, perhaps you might see if they would be
    willing to make it right.

    Why, yes, I've contacted Waterford Precision Bicycles (Boy, it was
    tough resisting that one!), as I mentioned earlier in this thread,
    explaining what problem was.

    Sorry, I didn't see in your post that you had done this.

    Quoted message said:

    Today, I was offered the opportunity to send the frame back to them.
    Problem is, they're in WI and I'm in WA. I'm not real thrilled
    about the increased potential for damage to the frame inherent in
    two more cross-country trips with shipping companies, not to mention
    having to pay to send it there. So, I've counter-offered to take
    the frame to a local bike shop and get the re-reaming done and send
    the bill to Waterford for reimbursement. I'll see what they think
    about that idea tomorrow.

    At least I know from their reply that Waterford thinks it's okay
    to re-ream the seat tube to correct this problem. I don't know how
    thin the walls of those tubes are, nor what the potential weakening
    effect of taking more metal off in the process of trying to
    straighten out the reaming would be, but I'm relieved to hear that
    this may be correctable.

    If it were my frame, I'd ship it to them and ask them to refund my
    shipping costs if the frame is in fact incorrectly made. And to
    replace the frame if it is. They might or might not go for the
    shipping thing. The rest should be handled under warranty, as ISTR
    that the frame is quite new.

    The tubing is already quite thin and I would not trust a bike shop to
    re-ream it without causing further damage. A custom frame builder
    with much experience, perhaps; but not a bike shop (unless I was very
    sure of the mechanic's skills, that is). You can see the wall
    thickness by looking at the top of the tube, unless there is some kind
    of lip or lug applied to the top for a pinch bolt. My Gunnar has a
    separate aluminum collar for the pinch bolt, and the tubing thickness
    is easy to see.

    Quoted message said:

    I'll let you know how "excellent" their customer service turns out
    to be.

    I hope it turns out well.

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