So my nephew just bought a extremely clean, low mileage 1992 FZR 600 for his first streetbike. Being that he's 2000 miles away I can only help so much. Anyway he's trying to find new tires so he can do a few classes and trackdays come springtime. He says the rear rim is 18 inches. but the front is 17. Was that a thing on these back then? What 17 inch rear will fit on this? Anyone have one laying around for sale?