The RS3 Cube
is a prototype race motorcycle that was developed by Aprilia
to compete in the 2002 and 2003 MotoGP
seasons. It was unveiled at the Bologna Motor Show
in December 2001 by Aprilia's president, Ivano Beggio, and their race boss, Jan Witteveen. The Cube is powered by a 990 cc inline-3 four-stroke
engine (to conform to MotoGP rules of that time). Due to its tendency to wheelie easily, lack of front-end feel, vibration from both the front and rear wheels, and unpredictable response from its fly-by-wire throttle system, Cube rider Colin Edwards
proclaimed the bike was "born bad,"
and it had "just so many things that need fixing."
His teammate on the 2003 Aprilia team, Noriyuki Haga
, crashed the Cube 28 times in a single season. The RS3 Cube did not compete in any following MotoGP seasons. The engine was considered the most powerful at that time, producing about . A testbed that never was raced produced at one point, before Aprilia bowed out of MotoGP.