https://www.timken.com/wp-content/up...el-Bearing.pdf
This is a PDF. Timken, you know ...
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Loose inner race fit helps ease assembly and bearing adjustment. The loose fit allows the inner race to easily slide along the spindle while tightening the nut during bearing adjustment.Avoid excessively loose fits to prevent misalignment within the wheel end. Misalignment will cause premature wear of bearings and seals. Measure spindle diameter during wheel end service to ensure that there is not excessive spindle wear. Inspect the top and bottom of the spindle. The underside may show wear even when the top appears in good condition. Replace the spindle if the spindle diameter is less than the OEM’s specifications."