Ok so not having my bike anywhere near me at the moment to pull apart and look, I have a question that's eating me.
Went from Spesh E150 SL forms with a 25mm bolt through on Roval hubs to a 20mm Syntace on my X-Fusions. The hubs came with 20mm spacers so I just popped the 25mm ones out and stuck the 20's in.
Now the more I think about it I can't think how the bearings are loaded/working. Should I be getting some 20mm x 37mm x 7mm bearings?