John Gill Commentary 1 Kings 7:32

"And the four wheels were underneath the panels; and the axletrees of the wheels were in the base: and the height of a wheel was a cubit and half a cubit." — 1 Kings 7:32 (ASV)

And under the borders were four wheels
Not under the borders last mentioned, but those in (1 Kings 7:29) ,

and the axle trees of the wheels [were] joined to the base ;
to the four sides of it:

and the height of a wheel was a cubit and half a cubit ;
that is, from the plate of brass on which it stood, to the axis or semicircle of it; so that the highest part of the ring being also a cubit and an half, reached to the top of the base, it being but three cubits high, (1 Kings 7:27) .