The XRAY 940513 bearings, sized 5x12x4mm and sold in a set of two, are a practical choice for reducing drivetrain resistance and smoothing out wheel spin on both on-road and off-road models.
These bearings use a rubber seal to keep grit and moisture away from the rolling elements, and they come lightly greased for immediate low-friction operation. A higher count of slightly larger balls within the cage helps distribute loads and improves durability under stress.
The removable side shields make routine maintenance straightforward, so you can service the bearings quickly and restore peak performance without replacing the entire unit.
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