I have tested whit this solution:
I create PadClass Named Not 1.7mm and select the pad for this classes.
I create Rule Routing Width: Min,Pref,Max 0,25mm and Select All Priority 2
I create Rule Routing Width: Min 0,25 and Pref,Max 1,7mm And write this Query= InNet('GND') and not InPadClass('Not 1.7mm')