If its the screw on freehub like the MT68 wheels, which seem to have the same as the Saint, XT, etc, then they are terrible hubs. I am on my third freehub in 6 months of possibly 120 miles of riding. Even got the part codes stuck on my garage wall of FH- M678 . Just couldn’t trust it again, so found a replacement hub ( Easton) and re built using that, this week, as they are 24 spoke hubs on the MT68’s , so quite tricky to source. Not Shimanos greatest hubs. The through axle means smaller freehub bearing and 3/16 balls on the axle. The freehub body shell is so thin, they crack open