Topic: Has anyone measured their rear wheel bearings and shaft

[rhinoracer]

I need replacement bearings, the old ones are stamped 304S. Cross referencing gives me 52x20x15mm size.

I measured the bearing ID (Bore) and it measures 19.94mm
The axle shaft measures at 19.85-19.91mm

The axle shaft slips into the bearing but there's no sideplay, in other words it fits snug.

I tried fitting the axle shaft into the caliper set at 20mm and it fits loose.

My question is: Are 6304 bearings the proper size, or are OEM bearings specially fitted.

[nippon]

6304 bearings will fit the rear wheel perfectly.

nippon