x3. They are ment for water use not over the road. It takes about 15 minutes a wheel to disassemble, clean, repack and re assemble. As I drive both on and off road, I do it in the spring when I wake up the trailer for the season. Then you know what you got. What have I found over the years? Leaking seals with grease into the brake drums and a bad bearing. I also carry an extra set to seals and 2 sets of bearings, grease with me. having already been stuck with a brake problem in the middle of nowhere as taught me to carry critical spares. Things that need to make me roll again.. Look up grease tt bearings on youtube, many examples. Happy Trails