What bike/sizes are these tires for?

[ecumike]

It turns out I have some front tires that I got for cheap that I can't really use as rears.  They are all never used, except 1 that looks like it's been ridden on for only 100 yards.  I'll dump these for cheap, but don't know what/who/kinda bike they could go on to sell to.   Are these 600/750/1000 slicks? is there even a difference?

I have:

Dunlop:
(2) Front - KR106 - 120/60/17
(1) Front - KR106 - 120/75/17

B'Stone:
(1) Rear - YCX - 120/595/17


I'll be bringing theses to VIR this weekend in case someone wants them.