This set contains four Serpent 440160 ball bearings, each 6.35x9.5x3.2mm, created for replacement use on Mini Spyder MT models. They are supplied to swap out aged or damaged bearings in wheel hubs and driveline mounts, restoring smoother turning and reducing looseness at bearing positions.
Fitting these bearings is a routine maintenance task for experienced hobbyists: detach the wheel or relevant component, remove the old bearing, and press the new bearing home so it sits flush in the hub or carrier. Employ the right tools to protect seals and housings, and double-check that the 6.35mm inner diameter matches your shaft prior to reassembly.
To maintain performance, clean bearings periodically, check for side play or rough rotation, and apply a small amount of bearing oil if recommended by your service habits. Swapping in a new set can lower drivetrain friction and sharpen steering feel on compact monster truck rigs.
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