Ok, so this is something I've only noticed recently, and I think I may be over-thinking this completely, but I've noticed that at low speed, say 25mph or so, if I zig-zag very quickly with the clutch pulled in, I get a feeling from the back end like a thump-clip-clip-pat-pat-pat-pat, almost like I'm doing this on knobbies.
Rear shock was replaced not too long ago with the Progressive. Rear tyre is an Avon Azzaro. I'm thinking it's the treads that are making that feeling, as I've had the wheel bearings checked, and they're fine, as are the swingarm bearings. I did also notice that if I rock the back wheel forward and backward a little, it makes a thunk-thunk sound. Last time the gear oil was changed was about 7500 miles ago, and I change it every 10k miles with Mobil-1 synthetic 80-90wt. Could it be that it's just the treads doing this? I don't remember it feeling like that when I had the Dunlops or the Pirellis on it. Bike has just over 63k on the clock now.
Also, for as long as I've had this, that thunk noise has been present in the rear wheel if I rock it back and forth, so not sure if this is normal or not...