MAX bearings are designed specifically for suspension pivots without retainers and 40% more balls than standard ABEC 3 or 5 bearings. This enables them to carry a much higher load and makes them perfect for frame pivots. They are also packed with CRC Marine Grease, which will not wash out or break down when wet ensuring your frame bearings last even longer.Bearing Code: SMR 2231Dimensions: 22mm x 31mm x 7mmABEC: 5Grade: 5Seals: LLUGrease: Kyodo Yushi PS-2Application: Hubs, Bottom Brackets