The Buell 1125R is a sport bike that was manufactured by Buell Motorcycle Company in the United States. It was introduced in July 2007 for the 2008 model year. Production of road-going models ceased in October 2009, when Erik Buell announced the cessation of production for the entire Buell range. In November 2009, Buell founder Erik Buell launched Erik Buell Racing, which produce race-only versions of the 1125R.
It is powered by a 1,125 cc (68.7 cu in) Helicon V-twin engine produced by BRP-Powertrain (Rotax) of Austria. This liquid-cooled engine has a V angle of 72° and produces a reported 146 hp (109 kW), with a maximum rpm limit of 10,500.