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Frame "going down" when steering?

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Frame "going down" when steering?

Old 11-11-14, 03:43 PM
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Frame "going down" when steering?


just got an IRO Mark V frame with an ordinary 700c fork (straight arms too, but not Iro`s originaly) and i feel the frame headpart "going down" during the steering and backing up again when riding in a straight line.

thats weird, anyone experienced that or even heard about it?? its just my impression or frame geometry/fork issue?


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Old 11-11-14, 04:22 PM
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Sounds like a mismatch between the frame's head tube angle and the fork's offset (rake). Whether the fork legs are straight or curved doesn't matter.
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Old 11-12-14, 06:37 AM
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Do you adequate pressure in your front tire?
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Old 11-12-14, 08:01 AM
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Pictures of the bike would be nice. One with wheel straight, one with wheel turned to the left or right.

At first, I thought you might just have a loose headset which would give you a 'thunk' or 'clunk' sound when braking, along with some movement. But I think TejanoTrackie has called it.

check this out: Bicycle Steering Geometry

Dave Moulton's Blog - Dave Moulton's Bike Blog - Trail, fork rake, and a little bit of*history

and lots more reading here: Spectrum Cycles | Geometry

Do you feel the handling of the bike is too twitchy at low speeds? Can you ride no hands? The frame should not be moving down but may feel like it is because the wheel wants to turn so easily.

Again, pictures would be a big help. Also identify the fork; see if you find any info on it. What size frame do you have? The headtube angle changes as the frame size changes.
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