I have a superbike SC2 rear 180/55/17 with decent wear indicators, and an SC1 front as well. Nick reckons they get off the good sticky rubber before they get all the way down.
Also got a set of Q2's I took off bike 6 months ago.
I'll see if there is room to pack them. Or PM me ... I'm at Como in the Shire ... just round the corna.