Push the spacer between the bearings off to one side. Get a chisel or an old screw driver and tap the inner race of the bearing out from the opposite side. Save the spacer. Flip the wheel over and tap out the other side. Grind the outer edge off one of the old bearings and place it over the new bearing. Tap on the old bearing to drive the new bearing into place. You may have to finish the install with a chisel on the outer race. Alternate tapping from side to side being careful not to damage seal. Flip the wheel over put the spacer back into the wheel and tap the new bearing into place so that it barely touches the spacer. The bearings should spin freely, but should not bind (inner races pushing too hard against spacer will cause binding). If you install too tightly reach through the wheel and tap on the opposite bearing only enough to stop the binding. Press in the seals and reinstall the wheel on the bike.
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