The Aprilia RSV 1000 R’s top speed is 173 mph (278 km/h), ... The Yamaha YZF-R1 was released in 1998 by Yamaha Motor Company and has undergone updates over the years.

2011 Yamaha YZF-R1 Details and Photos. autoevolution ... The sportbike also uses a compact close-ratio 6-speed transmission that features optimized gear ratios, ... Top Speed - 280.9 km/h (174 mph) ...

However, the official top speed of the R6 is around 260 km/h (161 mph), and even if the bike was modified, there is no point in modding it with a cut-off at 299 km/h, is it?