The sub-400cc junior supersports sector now has four main challengers for its throne - the Honda CBR300R, KTM RC390, Yamaha YZF-R3, and the Kawasaki .brIn this episode of On Two Wheels we evaluate Hondas CBR300R, Kawasakis Ninja 300, KTMs new RC390, and Yamahas new YZF-R3. Which bike is the best .brDeciding a one-size-fits-all winner in the quarter litre segment is a tricky affair. These motorcycles are the stepping stone into more evolved performance .brHondas CBR300R and CBR500R take on the new KTM RC390 and Kawasaki Ninja 300 in the battle of the A2 license bikes. Just how much fun can you have .