I got my 2008 ninja 250 last summer. When I bought it, it had about 9000 km on it, and the original owner told me he had never changed the tires on it. I've put on about another 3k on it so its close to around 12000km now. The tread still looks ok, but I'm not sure if I should still get new tires or not. Not sure if it is advisably to change tires since all the kms are on those tires.