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Mono Fork Steering Query?

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RoyMacdonald View Drop Down
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    Posted: 11 March 2018 at 11:54am
I've just bought a Fugin with a Mono fork, but when pushed as in wheeling it along by hand it runs to the monoblade side unless you hold the tiller to keep it straight. Is this normal or do I need to investigate the alignment? None of my other bikes twin fork have ever done this.

Roy


Edited by RoyMacdonald - 11 March 2018 at 11:54am
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GeoffBird View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GeoffBird Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2018 at 1:26pm
If the steered mass is offset from the steering axis then there will be a force tending to steer the bike. This will be greater the shallower the head angle, and I think the Fujin has a fairly shallow angle. However, I would expect the force to be small. The other thing I know from experience is that it is harder to get a welded monoblade straight, compared with a conventional fork, as the weld stresses are asymmetric. I'd check the wheel is in line with the steering axis.

Edited by GeoffBird - 11 March 2018 at 1:27pm
Right Time - Right Place - Wrong Speed
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RoyMacdonald View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RoyMacdonald Quote  Post ReplyReply Direct Link To This Post Posted: 11 March 2018 at 7:59pm
Originally posted by GeoffBird GeoffBird wrote:

If the steered mass is offset from the steering axis then there will be a force tending to steer the bike. This will be greater the shallower the head angle, and I think the Fujin has a fairly shallow angle. However, I would expect the force to be small. The other thing I know from experience is that it is harder to get a welded monoblade straight, compared with a conventional fork, as the weld stresses are asymmetric. I'd check the wheel is in line with the steering axis.

Thanks Geoff. I think it's glued in place if it's like the Windcheeta joints. How do I check the wheel steering axis relationship?

Roy 
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RoyMacdonald View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote RoyMacdonald Quote  Post ReplyReply Direct Link To This Post Posted: 13 March 2018 at 11:17pm
I've realised the cause. It's because all the cables bar one go to the monfork side and it's the spring in the cables as they turn into the frame tube. All the cables run in the frame.
Roy
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