Pry off the rubber cap and there is a zerk fitting there to quick lube the bearings. Don't be surprised if it takes almost a tube of grease per wheel. They never put enough grease in them at the factory. So, if the previous owner never serviced the bearings, they most certainly will need more lube. I lift the wheel of the ground and spin it as I lube the bearings. The old grease will work its way out toward you as you spin it.
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