Velocity Cliffhangers are currently their strongest rim. The only other that I know of, that is stronger is the Ryde Andra Rims. World travelers like Alee from cyclingabout use the Andra 30 rims. My son bought a budget touring bicycle on sale and I rebuilt the wheels with Andra 30s and Sapim spokes. The Andra rims are the heaviest and the strongest rims available.If your not on a budget then I suggest a complete set with Phil Wood Hubs and The Cliffhanger or Andra rims. I would go 36 holes. Unlike the road, the dirt has allot more roughness to it.