Looking for intel on what the good currently available tires are for an older K100RS with the narrower wheels. Am going to help a friend change his tires, so he can save a few bucks. Tire sizes are (I think): front 100/90-V 18 or 100/90-VR 18 rear 130/90-V 17 or 130/90-VR 17 This really cuts down the available selection and seems to limit construction to bias ply. Anyone have favorites in that subset of things? He's not a high mileage rider, nor is he a ricky roadracer type. Some 2-up but not super heavily loaded.