It was actually a Mavic X517 that I used to replace the 217 with. I agree that the cartridge bearings don't seem to last as long as I would hope through rough conditions. I wonder if these would last any better.

• Installed with black seal facing out (blue side facing in towards the hub)
• 90% filled with Mobilux NGLI 2 synthetic grease, dual-lip labyrinth seals, full complement of bearings, up to 45% increased load capacity