What Are These Huge Objects Transported on Busy Upstate NY Road?

Every once in a while, you will see some weird and gigantic objects being transported on Upstate New York roadways. Today, I was driving on Route 9 near Clifton Park and Halfmoon and came upon these huge objects. They look like spools of something or wheels. There were two tractor-trailer beds, and they were carrying one on each bed. What do you think they are?

What Are These Gigantic Wheel-like Objects Being Transported on Busy Route 9 in Halfmoon?

I was driving on Route 9 near Clifton Park and Halfmoon and came upon these gigantic objects. They look like spools of something or wheels. There were two tractor-trailer beds, and they were carrying one on each bed. What do you think they are?

Gallery Credit: Chrissy-Townsquare Media