this post was submitted on 03 Jul 2023
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[–] Greg 3 points 2 years ago (3 children)

How does turning then inside out solve the problem of getting them on the post? I can't picture it in my head

[–] [email protected] 9 points 2 years ago* (last edited 2 years ago) (2 children)

Because the tire is topographically a radially flattened torus, when you turn it half inside out, it becomes a 2D mΓΆbius strip. At this point it effectively has only one side. When you push such construct horizontally against a solid, because the z-axis perpendicular to the strip has no negative values (it only has one side), if that coincides with the orientation of the βˆ‡Np of the solid, the z vector wraps around the solid. When the tire snaps to its rest state (inside in), it's easy to see why it ends up around the pillar.

This 3D animation demonstrates the concept:

https://youtu.be/xvFZjo5PgG0

[–] MajorMajormajormajor 1 points 2 years ago

Very enlightening response, thanks!

[–] Acester47 1 points 2 years ago

That doesn't make sense to me either

Either there is a seam in the tires, or the post...or the tires were put on while the post was built. I'm stumped πŸ€”

[–] [email protected] 1 points 2 years ago* (last edited 2 years ago) (1 children)

Honestly I'd just assume they cut them and use a torch to melt them back together. You'd probably never notice after a long enough time because of weathering and dust. Maybe even put there before it was capped off with the second floor?

[–] [email protected] 2 points 2 years ago

Vulcanized rubber tends to burn more easily than it melts. You could melt them back togeather but you need finer temp control than a normal torch offers. Odds are they were just glued back togeather. It's not like they're being used on the road so you don't need to worry about the glue holding up under those conditions. I'm also pretty sure I can see the line in the video where they were cut and glued.