Originally Posted by
BikeRider22
As I mentioned:
These same wheels have been used with an 8 speed cassette on this old road bike.
And a 10 speed cluster, on my Surly Cross Check.
I only use Shimano and compatible
Pay attention eh!
You might want to re-read the comment by icemilkcoffee immediately preceding yours - it was edited to add new info.
If icemilkcoffee is correct in saying your custom Michie cassette is wider than the Shimano-specified width for a 9-speed cassette, that may well be your problem.