tire moving on rim at the track
So, I'd heard of this; someone had posted here on the forum. Curious, I marked my track wheels with new tires (RE-71R) before a 2-day event. This is the right rear
wheel after 2 days: http://986forum.com/forums/uploads02...1569023379.jpg |
That's mind-blowing. The question is, was it the acceleration or braking that did it? If that's a pick of the right tire, it would be braking. If it's the left tire, then it would be acceleration.
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Actually. I think it’s the left rear. I get my hands mixed up!
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Here's a recent thread about it. You'll see I wasn't convinced, until I experienced it in dramatic fashion.
https://r.tapatalk.com/shareLink/topic?url=http%3A%2F%2F986Forum%2Ecom%2Fforums%2Fs howthread%2Ephp%3Ft%3D73341&share_tid=73341&share_ fid=31135&share_type=t&link_source=app You can see my marks on the sidewalls, which lined up with the valve stems at the beginning of the day. https://uploads.tapatalk-cdn.com/201...5292f76e4a.jpghttps://uploads.tapatalk-cdn.com/201...1600ce14b3.jpg Sent from my SM-G970U using Tapatalk |
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. |
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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? |
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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. Sent from my SM-G970U using Tapatalk |
Well, so much for precision wheel balancing! :rolleyes:
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Sent from my SM-G970U using Tapatalk |
So, do street tires do this in day to day driving? Anyone checked?
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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? ;) |
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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. Sent from my SM-G970U using Tapatalk |
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:cheers: |
So, judging from the position of the valve stems, unless the rear tires rotated over 270 degrees, the top pic should be the tires from the left, correct?
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How in the world does this happen and not break the bead/seal? Are the tires getting hot enough to somehow soften the bead enough to allow this? That’s pretty crazy. I’ll have to mark mine next time out...
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I’m shocked that you guys are so shocked by this. :D
Seriously... |
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Seriously, I'd never think that was possible unless I saw the pics. But then again, I've never tracked. |
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Now I do. ;-) Sent from my SM-G970U using Tapatalk |
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