|Production||2008–2009 by Buell
2009– by Erik Buell Racing
|Engine||Rotax Helicon: liquid-cooled 72° V-twin, 1,124.9 cc (68.65 cu in), DOHC, 4 valves per cylinder, Finger followers, shims, DDFI III fuel injection, 6-hole-injectors, Dual 61 mm (2.4 in) down draft throttle bodies, pressurized RAM Air intake, dry-sump lubrication|
|Bore / stroke||103.0 mm × 67.5 mm (4.06 in × 2.66 in)|
|Top speed||158 mph (254 km/h)|
|Power||127.1 hp (94.8 kW)|
|Torque||71.1 lbf·ft (96.4 N·m)|
|Transmission||6-speed, Belt drive, HVA Slipper clutch|
|Suspension||front: Fully adjustable 47 mm Showa inverted fork, 120 mm (4.7 in) suspension travel
rear: Fully adjustable Showa coil over monoshock, 127 mm (5.0 in) suspension travel
|Brakes||Front: ZTL2 8-piston rim-mounted 375 mm (14.8 in) single disc
Rear: 2-piston caliper,240 mm (9.4 in) disc
|Tires||OEM: Pirelli Diablo Corsa III
Front: 120/70 ZR-17
@ 3.50 in × 17 in (89 mm × 432 mm) cast aluminium wheel
Rear: 180/55 ZR-17
@ 5.50 in × 17 in (140 mm × 432 mm) cast aluminium wheel
|Rake, trail||21.0° / 84 mm (3.3 in)|
|Wheelbase||1,375 mm (54.1 in)|
|Dimensions||L: 2,040 mm (80 in)
W: 716 mm (28.2 in)
|Seat height||30.5 in (775 mm)|
|Weight||466 lb (211 kg) (wet)|
|Fuel capacity||20.1 l (4.4 imp gal; 5.3 US gal)|
|Fuel consumption||32.6 mpg-US (7.2 L/100 km; 39.2 mpg-imp)|
|Related||Buell Firebolt XB12R, Buell 1125CR|
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 1125Rs (and all Buell models) ceased in October 2009. In November 2009, Buell founder Erik Buell launched Erik Buell Racing, which initially produced race-only versions of the 1125R.
The 1125R is powered by a 1,125 cc (68.7 cu in) Helicon V-twin engine made by BRP-Powertrain (Rotax) of Austria. The liquid-cooled engine has a V angle of 72 degrees and produces a claimed 146 hp (109 kW), with a rpm limit of 10,500. Motorcycle Consumer News tested 127.1 hp (94.8 kW) and 71.1 lbf·ft (96.4 N·m) at the rear wheel.
The Helicon engine's 72-degree layout differs from Buell's previous V-twins, which were based on 45 degree air-cooled Harley-Davidson Sportster motors, modified for greater efficiency and output.
The 1125R includes a number of unique design attributes. The patented frame design houses the bike's fuel. The single, eight-piston front brake, called ZTL2, features a 375 mm (14.8 in) inverted rotor that is directly attached to the front wheel rim. This feature enabled Buell to design a front end that was lighter and more responsive than traditional designs. The bike also uses an exhaust under the engine for greater volume. The frame, front end and exhaust all contribute to Buell's main design aim of mass centralization. Instead of a drive chain the 1125R uses a drive belt, which does not require lubrication or adjustment.