BMW Z4 103 style 17" wheel with slight buckle (Willaston CW5)

BMW Z4 103 style 17" wheel with slight buckle. Tyre has a decent amount of tread on it, maybe 5/6 mm, but I haven't measured it. Some slight cracks between the blocks.
The buckle wasn't noticable most of the time but was evident when braking with a reasonably firm foot from 70mph.
The wheel has been painted previously.