See below for the photos and video.
I have Kaly hubs and Evolve tires which are 175x50. I’ve measured the space for the hub and it is within a millimeter. I’ve tried soap and water, I’ve sanded the edges down a little and am told heat may help make the tires softer so they loosen up.
I believe these tires will fit but I need a workable technique which does not compromise the tire.
My measurement shows 90mm and 94mm.