Buell 1125R

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Buell 1125R
Buell 1125R.JPG
Manufacturer Buell
Production 2008–2009 by Buell
2009– by Erik Buell Racing
Class Sport bike
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)
Compression ratio 12.3:1
Top speed 158 mph (254 km/h)[1]
Power 127.1 hp (94.8 kW)[1]
Torque 71.1 lbf·ft (96.4 N·m)[1]
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)[1] (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)[1]
Related Buell Firebolt XB12R, Buell 1125CR
A Midnight Black 1125R

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.[2]

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.[3] Motorcycle Consumer News tested 127.1 hp (94.8 kW) and 71.1 lbf·ft (96.4 N·m) at the rear wheel.[1]

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.


  1. ^ a b c d e f "Performance Index - Winter ‘11/’12 Edition", Motorcycle Consumer News (Bowtie Magazines), January 2012, retrieved November 3, 2012 
  2. ^ "ERIK BUELL ESTABLISHES ERIK BUELL RACING". Buell Motorcycle Company. Retrieved 23 November 2009. 
  3. ^ Buell 1125r specs

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