tire moving on rim at the track

[NewArt]

Actually. I think it’s the left rear. I get my hands mixed up! ��

[rexcramer]

The original pic doesn't look like all that much of a shift. I remember other posts' showing +/-6" IIRC from track days. I would imagine the rears show far more of a shift than the fronts?

EDIT: Maytag looks about right.

[NewArt]

Originally Posted by rexcramer

The original pic doesn't look like all that much of a shift. I remember other posts' showing +/-6" IIRC from track days. I would imagine the rears show far more of a shift than the fronts?

EDIT: Maytag looks about right.

Yeah, I thought that the previous post was an anomaly, but I now see that this is common for track tires. Maytag’s pictures bowled me over! The movement of my tires is negligible in comparison.

[maytag]

Originally Posted by NewArt

Yeah, I thought that the previous post was an anomaly, but I now see that this is common for track tires. Maytag’s pictures bowled me over! The movement of my tires is negligible in comparison.

The guys at the track that day told me that's very common. I'd have never believed it, had it not happened to me.

And piper, as for what tire is what in my photos, I don't recall now. But I'd think it only makes sense that the rears spin under power (so the wheel turns "forward" in the tire) and the fronts under braking (so the tire turns "forward" on the wheel).

Dunno.

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[piper6909]

Originally Posted by maytag

The guys at the track that day told me that's very common. I'd have never believed it, had it not happened to me.

And piper, as for what tire is what in my photos, I don't recall now. But I'd think it only makes sense that the rears spin under power (so the wheel turns "forward" in the tire) and the fronts under braking (so the tire turns "forward" on the wheel).

Dunno.

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If we know which side the wheels/tires came from and the direction of the rotation, we can determine if it's braking or accelerating causing it. I suspect that even an S doesn't have enough torque to cause this under acceleration.

My theory is that it's caused by breaking, and the front tires rotate more than the rears, because the fronts brake harder.

I probably won't track until next year, and if I do I probably won't drive it as hard as some people on here because I don't have the skills. So it would be great if someone would try the experiment and note which corner each tire/wheel was on. Maytag, would you be so kind?

[maytag]

Originally Posted by piper6909

If we know which side the wheels/tires came from and the direction of the rotation, we can determine if it's braking or accelerating causing it. I suspect that even an S doesn't have enough torque to cause this under acceleration.



My theory is that it's caused by breaking, and the front tires rotate more than the rears, because the fronts brake harder.



I probably won't track until next year, and if I do I probably won't drive it as hard as some people on here because I don't have the skills. So it would be great if someone would try the experiment and note which corner each tire/wheel was on. Maytag, would you be so kind?

Well what I do know, is that you're looking at a rear laying flat and a front from the same side leaning against it, in both images. I just don't remember which image is left or right.

As you can see, they're rotating opposite directions on the wheels.

There's very, VERY little braking going on on the rear wheels, especially at the racetrack where brakes are usually on VERY HARD, or not at all. There is SUBSTANTIALLY more torque being applied to the rear wheels under acceleration than under braking.

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[piper6909]

Originally Posted by maytag

Well what I do know, is that you're looking at a rear laying flat and a front from the same side leaning against it, in both images. I just don't remember which image is left or right.

As you can see, they're rotating opposite directions on the wheels.

There's very, VERY little braking going on on the rear wheels, especially at the racetrack where brakes are usually on VERY HARD, or not at all. There is SUBSTANTIALLY more torque being applied to the rear wheels under acceleration than under braking.

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Ok. I didn't think they would put out that much torque to rotate the tires on the rims. You know more than I do, so I'll take your word for it.

[piper6909]

Originally Posted by NewArt

Actually. I think it’s the left rear. I get my hands mixed up! ��

Then it must be happening during acceleration. I was expecting the opposite. I didn't think they had enough torque to do that.

But then again, it looks like all 4 tires moved, so it has to be during braking. Are you sure it came from the left (driver's) side?