I've just changed back and front wheels on my pcx 125 + cleaning rear drum and front break pads. After I installed back the wheels, stood it up on the central stand and tried to manually turn the wheels just to try them and especially the front one was really hard to turn, the rear one is less stiff but still a bit harder to turn. Before this service, when stood up on the central stand and with engine on, the rear wheel was turning by itself without revving, now this doesn't happen.
Could anyone suggest what the reason of this could be?

Many thanks.
- Regards, Kris.