The Pilot Street Radial is made in sizes to fit the wheels of the CBR250R/CBR300R. Needless to say the Pilot Street Radial is superior to the Pilot Street bias ply tire. And the PSR is not very expensive relative to the prices for other top shelf, name brand tires. For example, Revzilla is currently offering the Michelin Pilot Street Radial at $100.82 USD for a 110/70R17 front, and $111.61 USD for the 140/70R17 rear. Those prices also includes free shipping in the US.I have used two rear and one front of the original IRC Roadwinner which took me 31,000 miles through dark, rain, and wind. I then took off the Michelin Pilot Street Bias that came on my R3 and put them on the CBR250R and have another 24,000 on those .The rear is whipped. The front feels choppy. The fuel efficieny improved several percent with the michelins so I bought another pair of new take offs from the R3 forum for $75 shipped. They are not the stickiest tire but last really well for commuting and touring and both of these work well right out of the garage in all temps and rain. I bought Bridgestone S20 evo's for the R3 and they are much stickier and the ride quality is very nice being a soft radial but this size is single compound and both front and rear have big flat centers already at 3,000 miles. Only for canyon racers that don't rack up many miles. The nicest tire I have ridden is the Michelin Pilot Road 3 or 4 on the FZ07. Fantastic smooth ride quality and the best wet braking in tests. But they don't make them in our size.
If you rack up miles, I would recommend buying a set of take offs from an R3 or CBR300 for half price.