I’ll get some calipers at the weekend. I think its a bit of both, hub being 98 and a bit and the fork being 101 ish. Hard to do with a ruler though which is all I’ve had to hand.
I’m interested in if I can get away with the spacer though, I’d like to run both together if possible. Both are used purchases so its not a case of sending stuff back.
Thinking about it, I can see what space my wheel off my trail bike has, that will help diagnose the actual issue of the 3mm.