The longest I've ridden the bike is to work which is only like 10 km away. I don't think it gets any better or worse.
I don't think its tire-related. It may just be my subconscious being more sensitive now that by bike fees weird, but I think the bike is vibrating harder than usual at idle too.... which reminds me: My bike usually idles at 1500rpms and today i found it idling at around 2000.... A twist of the idle knob solved that problem thou.
Maybe I should try changing the oil or something...