The tires that are blowing at 300km/h are on race bikes. Those tires take a lot of abuse, and that causes them to fail, its not just the going 300km/h part.
Now your bike is not capable of going 300km/h anyway, a stock 600 will only go about 260km/h. Even something like a ZX12R just hits 300 (well 299 actually).
To even get a 600 upto that speed you would need to get a smaller rear sprocket, much smaller (or a bigger front one)
And lastly, going 300km/h on the street is a dumb idea.. If you can find a racetrack that has a long enough straight away, more power to you, but not a good idea on the street.
Now your bike is not capable of going 300km/h anyway, a stock 600 will only go about 260km/h. Even something like a ZX12R just hits 300 (well 299 actually).
To even get a 600 upto that speed you would need to get a smaller rear sprocket, much smaller (or a bigger front one)
And lastly, going 300km/h on the street is a dumb idea.. If you can find a racetrack that has a long enough straight away, more power to you, but not a good idea on the street.