Oi Loikes 180's...cos neither of my bikes will take a 190 happily so I've never tried.
It all depends on the profile of the tyre IMHO. With Bridgestones or Pirellis on my ST I only have a couple of millimetres unscrubbed on the rear but the front has much wider strips. When I put Dunlop 207RR's on it the wear on the front went right to the edge but left a centimetre sized chicken strip at the rear.
No other changes to suspension, ride height, tyre sizes, pressures or riding style but swapping tyres swapped the end that had chicken strips.
On balance, I know that the nearer to the edge of a tyre you get the smaller the contact patch becomes and the less grip you've got - so I'd rather stay with a front tyre that copes with my speed of riding without troubling the edge of the tyre (except on trackdays).
I don't mind the odd little slide from the rear tyre, it's when the front lets go that I get skidmarks
