I'm not sure it would.I'd go with a 180/55/17 it would work best on your ZX11 and handle better than a 170/60 or 190/50. But a 190/50/17 would fit on it. I love my new Bridgestone BT-016's on my ZX12r. 190/55/17 is what I have on it.
Both ZX11 (C & D) have a 5½ in. wide rear rim. Stock tire is a 170 on C and 180 on D, probably because 180 were not available when C was introduced. 180 works good on a C but I would not go with a 190 on a C. Pretty sure a 190 works on a D though but handling will suffer slightly.I'm not sure it would.
Sounds like Dave owns a C model which was sold with narrower rims, I think a 170 was fitted as standard, whereas the D model came with larger rims and a 180 OE which could be pushed to a 190, just.