Hi the difference between Xc &Pro2 front is you can buy adaptor’s to run 20mm front axle etc on the Pro2’s ,i,ve had both & think the XC hub’s are less maintenance ,not sure about the bearing’s in the Pro 2 but if you look at the maintenance section on Hope website you’ll find out,Hope don’t do the XC hubs anymore 🙁 The after sales service from Hope is excellent 😀