So when I modify the tire/wheel, there is a field for wheel_offset. Which makes perfect sense. The wheel center is a design position on the intersection between the spin axis and the mating surface where the wheel is bolted on. On this design, different wheels can be used with different offsets. That will among other things change the scrub radius. The problems are This parameter is not used by anything. Changing it does not move the tire in or out. Using the suspension testrig, there is nowhere to set this parameter. As this is using a testrig tire that does not expose this parameter. I can change it by manually search for this variable and change it. But it looks like an oversight. And it does not change the scrub radius or anything else in the simulation OK, it is easy to fix for the full vehicle tire template, but it seems wrong to me. Anyone else looked into this? @Martin Kieltsch you must have fixed this?

Wheel offset?

So when I modify the tire/wheel, there is a field for wheel_offset. Which makes perfect sense. The wheel center is a design position on the intersection between the spin axis and the mating surface where the wheel is bolted on. On this design, different wheels can be used with different offsets. That will among other things change the scrub radius.

The problems are

This parameter is not used by anything. Changing it does not move the tire in or out.
Using the suspension testrig, there is nowhere to set this parameter. As this is using a testrig tire that does not expose this parameter. I can change it by manually search for this variable and change it. But it looks like an oversight. And it does not change the scrub radius or anything else in the simulation

OK, it is easy to fix for the full vehicle tire template, but it seems wrong to me.

Anyone else looked into this? @Martin Kieltsch you must have fixed this?

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0 Jesper Slattengren over 7 years ago

Visualization... It is useful to have a visual feedback. But more important is where the forces from the wheel acts.

But it is really a question of where the center plane of the tire is. And that is disconnected from the wheel center.

As I explained, the wheel center is a design parameter of the suspension (really a sort of misnomer as it is not connected to the wheel). On that suspension you can put on any wheel that is the right size and the right bolt pattern (and clears the calipers). It is not uncommon to have different wheel offsets on the same suspension to fit a wider tire for a stronger engine. And I don't want to have to change my suspension model to test the behavior for different wheels.

So the offset will move the tire itself in or out.
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0 Jesper Slattengren over 7 years ago

Visualization... It is useful to have a visual feedback. But more important is where the forces from the wheel acts.

But it is really a question of where the center plane of the tire is. And that is disconnected from the wheel center.

As I explained, the wheel center is a design parameter of the suspension (really a sort of misnomer as it is not connected to the wheel). On that suspension you can put on any wheel that is the right size and the right bolt pattern (and clears the calipers). It is not uncommon to have different wheel offsets on the same suspension to fit a wider tire for a stronger engine. And I don't want to have to change my suspension model to test the behavior for different wheels.

So the offset will move the tire itself in or out.
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