Used to replace Puch Maxi Leuleu wheels with 0.5mm spacer to replace sealed bearings. I already did a rebuild but ruined the center spacer in my rear wheel and burned out the bearings. A bit cheap seals but they work well and I couldn't beat the price for 5 wheel bearings. Spins freely with no issues or noise after 200 miles of hard riding, averaging 30+ to 52.