Used tire floating up into clouds.

Mid-afternoon as I sat in front of my sister-in-law's home, I witnessed a 'used tire' rise from the backyard of the house across the street.
The 'used tire' very slowly rotated end-over-end as it very slowly traveled away from me.
It took at least eight minutes to slowly rise and slowly travel up-and-away until it was too indistinct to see against the distant clouds.
There was no wind nor other cause for the 'used tire' to rise and travel.
I heard no sound,  I saw no lights from the 'used tire'.