26" ROAD TYRE (25-559)

chickenlegs
chickenlegs Posts: 246
edited February 2015 in Workshop
Currently running Continental Grand Prix (folders) - 25-559 on my wife's bike, these are no longer made by Continental.
Local Bike Shop supplied Continental Grand Prix 28-559 (wire bead). These do not fit being too large a diameter to clear mudguard.
Have now been told that Continental Gatorskin 28-559 (wire bead) will fit ?????

Has anyone any suggestions re other tyre brands that would be suitable?
Preference is for folders and fairly lightweight if possible.