'17 Road Glide Ultra report - Page 9 - GL1800Riders
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post #81 of 83 (permalink) Old 05-12-2017, 01:32 PM
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Originally Posted by bigbird1 View Post
Whoa, there Sparky.
I think you misunderstood my description of self-centreing.
He jacked up the front end of an HD. He turned the handlebars to full left lock and released them.
The bars moved back to the centred position on their own. He repeated this turning the handlebar to right lock and on releasing, they self centred.
Try that on a Goldwing. The bars stay in the position they were left in.
That's what I'm talking about, not self centering when the bike is moving.
I have no idea what the difference in rake and front wheel/tire weight between the two bikes is, but that would have a huge impact on centering. But odds are what your describing has more to do with slack in cables and wiring.

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post #82 of 83 (permalink) Old 05-12-2017, 01:41 PM
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Thanks murf. A short description in a post couldn't do the complex subject justice. I read through the link you posted, and it pretty much said the same thing I did, only better.

I was surprised to find one little tidbit that probably explains what was demo'd to Bigbird1. It would certainly throw the weight off axis and cause the wheel to center itself. Here is the excerpt I am referring to. I know next to nothing about Harleys, and never really pay much attention to details when I do see them. You seem to be highly knowledgeable about them, so maybe you recognize this geometry setup, and whether it is still in use today.

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Harley Put The Fork Tubes Where?
At low speeds, the effect of Rake is more pronounced than Trail. This is one reason why cruisers are sometimes such a handful when riding in town and during parking maneuvers. In 1980, Harley-Davidson wanted to reduce the steering effort of the then new Tour Glide so they reduced the Rake. That had the desired effect, but it reduced the Trail to the point where the bike became twitchy at high speed. Even with zero offset there wasn’t enough Trail, so in a bit of inspired engineering they placed the fork tubes behind the steering stem, which gave the front-end an unusual negative offset, but it pulled the wheel back, increasing Trail. Viola, they now had a bike that was maneuverable at low speeds, yet very stable at high speed. It looked odd but the fairing hid the unusual fork and the design eventually migrated to the rest of the HD touring bikes.
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post #83 of 83 (permalink) Old 05-17-2017, 03:20 PM
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Originally Posted by Sparky57 View Post
Thanks murf. A short description in a post couldn't do the complex subject justice. I read through the link you posted, and it pretty much said the same thing I did, only better.

I was surprised to find one little tidbit that probably explains what was demo'd to Bigbird1. It would certainly throw the weight off axis and cause the wheel to center itself. Here is the excerpt I am referring to. I know next to nothing about Harleys, and never really pay much attention to details when I do see them. You seem to be highly knowledgeable about them, so maybe you recognize this geometry setup, and whether it is still in use today.
The geometry setup is still in use today.
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