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  1. #1
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    Default David Bird Hardtail Tweak

    Hey all.

    Sold m chop but bought it back after the guy I sold it to left it on the side of the road and it got schmucked by a truck. I think the LH rear is tweaked a little.

    What is a good way to see if it is tweaked, and if it is, what is a good way to repair?

  2. #2
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    Quote Originally Posted by sdsbassist View Post

    What is a good way to see if it is tweaked, and if it is, what is a good way to repair?
    You will need a frame table or replace it....

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    Damaged tubular structures are generally inspected with reference to known straight components. If you think the frame is deformed, post photos of the suspected deformity and CLEAR pics of sides, front and rear of the bike.

    Hitting a painted structure hard enough to deform it will damage the paint. Give us something to work with.

    First, does the bike track straight and if not what does it do? Write us a book.

    Also check the wheel alignment and look over the forks because it's easy to get adjustable/removable components out of line.

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  5. #5
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    You can use a level to check if the axle is perpendicular to the neck.

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    I also think a good place to start would be to have the frame sand blasted and inspect every inch of it.

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    Level the bottom of the frame, then measure from axle to a known point on each side near the front such as upper front engine mount, then axle to rear engine mount, use a laser down the backbone and get a measurement to each axle plate from that centerline, use a level on the axle plates to see if both sides are vertical, and like SamHain said^^^, check if axle is level, use a sraightedge to check if the hardtail tubes and other frame rails are straight, check measurement between rear top rails at frame and near axle, same on bottom hardtail rails to check if hardtail is squished together or splayed apart, set frame on a centerline drawn on floor or table, check centre between axle plates and check alignment of neck - a long rod or laser setup in neck should point at that centerline on the floor.
    Last edited by TriNortchopz; 5 Days Ago at 11:29 PM.

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