BUILT FROM THE RIDER DOWN
For most superbike manufacturers, engineering the perfect sportbike begins with a focus on the machine. That’s not the case with Buell. For us, it all begins with the rider. Take a look at the Buell 1125R. Everything on this bike is there to give you more feel, more control and more confidence.
It features intuitive handling, an ideal rider environment and a broad, predictable powerband, compliments of the light and compact 1125cc liquid-cooled, DOHC V-Twin. It’s all there for a reason. And that reason is you.
The Intuitive Response Chassis (IRC) is the stiffest we’ve ever built, resulting in a bike that’s better able to hold a line with minimal flexing or bending. Constructed of lightweight aluminum, it responds to aggressive riding with precision and predictability, delivering an unprecedented amount of rider feedback, regardless of road conditions.
The cast-aluminum swing arm has been specifically designed for improved rear suspension geometry while its stiffness has been tuned for the 1125R. Its pivot shaft is carried in the engine cases to create a stiff connection between the rear wheel and the rest of the chassis. Slider bobbin added to the swingarm for protection and use of a rear stand.
With 5.3 gallons of fuel contained in the frame, as near to the center of mass as possible, the rider is able to spend more time on the road enjoying the 1125R’s precision handling and less time at the fuel pump.
Buell Zero Torsional Load (ZTL²) front brake utilizes a four-pad, eight-piston caliper inspired by the XBRR race motorcycle. A single 375mm rotor mounts directly to the rim producing outstanding stopping power. The caliper casting was optimized for torsional stiffness, yielding a more progressive and connected braking feel to the rider.
The rim-mounted design eliminates the need for load-bearing spokes or even a second disc, resulting in a front end assembly that is significantly lighter than competitive designs.
To match the stiffness of the main chassis, the 1125R uses a fully adjustable 47 mm Showa® inverted fork, contributing to superior feel and greater feedback. Spring rates and damping are optimized for agility and responsiveness.
Exhaust cans are heavy. It doesn’t make sense to hang them up high and off the back of the bike. Our underslung exhaust a Buell staple since 1985 concentrates the weight underneath the chassis to provide greater Mass Centralization. The result is a clean, uncluttered look, improved flickability and superior handling.
The 1125R exhaust system features a large-volume muffler tuned to produce a linear horsepower and torque curve.
The fully adjustable, piggyback-style Showa® monoshock lets you fine-tune the ride for your weight and riding style. Linklessly mounted to a pivot point placed forward on the engine case, it enhances rigidity while reducing squat during hard acceleration.
Pirelli® Diablo Corsa III tires feature a three-zone compound for optimum street and track use.
The rear brakes utilize a two-piston caliper and a 240mm stainless steel rotor. The caliper is mounted directly to the inner surface of the swing arm, hidden from view. The caliper weighs 1.5 pound less than a typical carrier-equipped rear caliper system, reducing unsprung weight and complexity.
Steel Braided Brake Lines
Both rear and front brakes are fitted with steel braided brake lines for a better correlation of lever pressure to brake pressure resulting in improved brake feel.
With braking forces distributed through the entire rim due to the ZTL perimeter mounted brake rotor, the Buell 6-spoke front wheel can be made extremely light. This reduces steering inertia and unsprung weight for better handling on the racetrack or the less-than-perfect streets you’ll ride every day.
A unique constant-tension pulley eliminates slack in the driveline, resulting in smoother on/off throttle transitions no matter what position the swingarm is in. Clean, quiet and extremely strong, the Veyance Hibrex belt with Flexten Plus technology never needs replacing, maintenance or adjustments of any kind. In addition, it weighs just 1.06 pounds, compared to drive chains that weigh four to five pounds.
A Buell exclusive, the powerful Buell Helicon® 1125cc, 72-degree, liquid-cooled, V-Twin engine.
Most powerful Buell street engine to date. By not compromising to conform with a race class spec, 1125cc’s gives this engine the right bore and stroke combination to deliver superbike power: 146 Hp. and 82 ft/lbs of torque, with a redline of 10,500 RPM. The broad powerband and seamless torque curve generates hard and fast acceleration from anywhere on the RPM range.
The look, sound, and feel of a V-Twin engine deliver the character and superior ride experience you expect on a Buell. The 72-degree V-angle creates a compact, efficiently packaged engine and allows additional weight to be distributed to the front of the bike. It also allows for inclusion of an optimum downdraft fuel intake system, thereby lowering the height of the center of gravity as well.
A big bore, short stroke and light flywheel deliver complete power and quick-revving performance.
The Buell Helicon motor’s valves are actuated with finger followers and adjusted with shims. Derived from F-1 race technology, finger follower valve actuation reduces friction and permits a quicker valve opening due to reduced weight. Shim replacement is quick and easy due to the unique follower retention system.
Immediate throttle response in any environment is delivered by the Helicon motor’s closed loop FI system. It provides constant feedback to the ECU based on environment and ensures an efficient mixture control system, resulting in smoother throttle operation and better fuel economy. The 61mm dual throttle bodies allow for superior air intake and optimum engine performance.
The single-cam-per-cylinder chain drive contributes to the engine’s compact design. The intake cam drive is driven by the chain while the exhaust cam is gear driven. It requires less space over the cylinder head than a three-sprocket design, reduces weight and allows the engine to be located in an optimum, forward position.
Durable and lightweight, the magnesium valve covers are another example of how Buell is able to keep the overall weight of the motorcycle extremely low.
By incorporating three separate primary balancing shafts into the motor – Buell has been able to significantly reduce vibration without adding weight and complexity to the chassis.
The dry sump improves power by increasing efficiency, while the integrated oil reservoir at the lower left side of engine keeps the engine compact and fluids low, contributing to mass centralization.
Twin radiators are mounted longitudinally within aerodynamic cowlings. The position of the radiator system allows the engine to be positioned forward in the chassis, creating a more optimal weight distribution from front to rear. In addition, the position of the cowlings captures free-flowing air, driving airflow into the cowlings (and away from the rider), directing the air for more efficient engine cooling.
By placing the compensation function in the transmission output sprocket rather than the wheel sprocket, unsprung weight is reduced, helping to improve handling.
The single-cam-per-cylinder chain-drive contributes to the engine’s compact design. The intake cam drive is driven by the chain while the exhaust cam is gear-driven. It requires less space over the cylinder head than a three-sprocket design, reduces weight and allows the engine to be located further forward.
The 6-speed, close-ratio transmission provides the rider the right gear on any ride and any situation.
The Helicon powertrain stacks the primary and secondary drives to yield a more compact overall design. This increases front weight distribution to aid in anti-squat and improve suspension response. It also allows Buell engineers to design a forward placement of swing arm pivot, providing room for a longer swing arm and better overall handling.
The smooth clutch lever effort and slipper-like action mechanism reduces engine braking during hard deceleration and enhances the overall rider experience.
The large, 12-liter airbox is designed to optimize air intake and accommodate a large, easy-to-service air filter.
Using computational fluid dynamics to optimize the air flow, the RAM air system pressurizes the air box for a performance gain at speeds over 80 mph.
An athletic riding position with a relaxed foot peg location provides control on the track and comfort on the street.
At just 375 lbs. dry, the 1125R is extremely lightweight. It feels quick and nimble, and makes cornering transitions effortless.
Aerodynamic front fairing and windshield shape optimize airflow over and around the rider.
The footpeg placement keeps you in an aggressive riding stance to optimize your ability to quickly shift your weight around the bike while still allowing for a comfortable body position that reduces weight and pressure on your hands.
The instrument cluster with ODIS (On-Board Diagnostic Information System) is cradled in a lightweight, magnesium module. Compact and easy to read both day and night, the LED screen has a wide, 50-degree viewing angle and features a service code display, security system with immobilizer, lap timer and splits, gear indicator, two trip odometers, ambient air temperature, and more.
Quiet Zone Cockpit is the result of aerodynamic design and testing of the front fairing and windshield shape. It optimizes airflow to reduce drag and increase rider comfort.
The rear section is clean and sleek with a passenger seat hidden under an easily removable cowling.
Clip-on style bars. The riding position helps use your body’s weight to move the bike through turns. Confident and in control, it offers great communication between rider and machine.
Colored windscreens add some style to provide a custom look.
The headlamps are incorporated into the front fairing and feature a six-bulb headlight system.
Front turn signals are incorporated into the aerodynamic mirror housing making it easier for other drivers to see where you’re going.
With rider comfort in mind, Buell features brake and clutch levers that are adjustable for reach. Foot controls (brake and shifter) feature toe pegs that adjust to rider foot size.
The side-mounted radiators and outer covers are designed to absorb an impact and minimize repair costs.
Tie-down hooks on the tail section make it easy to secure extra gear.
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