Originally Posted by HillRider

The hub is a 105 level with cup-and-cone bearings using 11x3/16" balls per side. However, it's specific to this Shimano pre-built wheelset and uses 12 radial laced bladed straight spokes with the nipples at the hub end. You can't replace it with a more common series hub.

I have the same wheel set on one bike with over 45,000 miles on them and they remain perfect.