Basically, my front wheel that has only seen about 16000 km seems to have slightly rough bearings if I rotate the end caps without pushing down on them. When I apply quite a bit of force on the end caps, the bearings seem to be smooth, it was not like this when new and I only noticed when replacing the tire. The rear wheel is still perfect and all bearings spin with ideal smoothness.
What would cause this and does it mean that my bearings are coming to an end (new bearings are those expensive SINC ceramics) ?
The wheels are never ridden in the rain and I make sure to take them off the bike if I'm doing a deep cleaning of the frame, even the brake tracks are still like new as I wipe the pa