2021 Ducati Streetfighter V4
The Panigale V4, stripped of its fairings and with high, wide handlebars. This, in short, is the underlying concept of the new Streetfighter V4, a bike that magnifies the thrill of the ride every time it takes to the road.
The result? An unrivalled naked bristling with cutting-edge technology and an awe-inspiring design that oozes pure performance.
The minimalist full-LED headlight captures the spirit of the Streetfighter V4 perfectly. On the one hand, it recalls the front of the Panigale V4 and, on the other, evokes the crazy grin of the Joker (the comic strip character from which the Ducati Style Center drew inspiration for this new Bologna-built naked). Already featured on the Panigale V4 and SuperSport, the V-shaped DRL is another clear Ducati hallmark.
The Panigale V4, stripped of its fairings and with high, wide handlebars. This, in short, is the underlying concept of the new Streetfighter V4, a bike that magnifies the thrill of the ride every time it takes to the road. The result? An unrivalled naked bristling with cutting-edge technology and an awe-inspiring design that oozes pure performance.
The minimalist full-LED headlight captures the spirit of the Streetfighter V4 perfectly. On the one hand, it recalls the front of the Panigale V4 and, on the other, evokes the crazy grin of the Joker (the comic strip character from which the Ducati Style Center drew inspiration for this new Bologna-built naked).
Already featured on the Panigale V4 and SuperSport, the V-shaped DRL is another clear Ducati hallmark.
The compact headlight is embedded in a meticulously designed dual-layer fairing that incorporates the air-box and LED cooling intakes; a rear deflector, instead, stops flows impacting the tank directly.
The headlight is surmounted by a 5" TFT screen (the same as the one on the Panigale V4) and features a smartly styled front cover that hides connectors and wiring.
The magic of Aerodynamics
Fast, agile mixed-road performance demands maximum stability at high speed and when braking, reduced wheel-up during acceleration and minimised electronic control of the suspension set-up: that's why Ducati Corse specialists have, together with the Ducati Style Centre, developed biplane wings for the Streetfighter V4.
The aerodynamics were developed using CFD (Computational Fluid Dynamics) simulation. The calculation method involved stationary simulation of flow and pressure to achieve increased downforce, especially on the front wheel.
The new Streetfighter V4 is powered by a 1103 cm3 Desmosedici Stradale engine. In this configuration the 90° V4 delivers 208 hp (153 kW) at 12,750 rpm, an unrivalled power level within the naked segment, perfectly in keeping with the all-out character of the new Streetfighter V4. Maximum torque is 123 Nm (12.5 kgm) at 11,500 rpm, practically unchanged with respect to the Panigale V4. Dedicated engine mapping lets riders safely make the most of Streetfighter V4 performance on the road.
The final ratio, shorter than that of the Panigale V4, delivers a wheel torque higher of +10%, which ensures an immediate response to the throttle command.
Power and torque can be raised to 220 hp (162 kW) and 130 Nm (13.2 kgm) by fitting the full-racing Ducati Performance exhaust by Akrapovič that also reduces weight by – 6 kg.
The Desmosedici Stradale was designed around the core of the V4 MotoGP engine – the cylinder heads. With the same dimensions and geometry as the Desmosedici GP, the Desmosedici Stradale offers the same outstanding fluid dynamics.
It also has the same engine configuration: 90° V4, rotated rearward by 42°. This solution makes the engine extremely compact, allowing centralisation of mass and flawless integration with the vehicle.
The box-in-box moulded aluminium pistons that slide inside the cylinder liners have two low-attrition oil rings and an 81 mm oil ring (the same as the one on the MotoGP Desmosedici engine). The 53.5 mm stroke takes total engine displacement to 1103 cm3. Racing-derived design is also underscored by a high compression ratio of 14:1.
The Desmosedici Stradale is designed around the Desmodromic system which helps make Ducati MotoGP and SBK bikes the fastest in these championships. On this high-revving engine the 'Desmo' system achieves a degree of sophistication, lightness and compactness never before seen on a Ducati. The four camshafts operate the sixteen steel valves: valve diameters are 34 mm on intakes and 27.5 mm on exhausts, values decidedly on the high side given the 81 mm bore. The valve seats are made of sintered steel.
Air intake is entrusted to four oval throttle bodies (52 mm diameter equivalent) connected to fixed 70 mm long intake horns. Each throttle body has two injectors: a sub-butterfly one for low-load use and another above it that comes into play when maximum engine performance is required. The throttle bodies of each cylinder bank are moved by a dedicated electric motor. Thanks to the full Ride by Wire system, this allows complex electronic control strategies and modulation of engine 'feel' according to selected riding mode.
To increase urban riding comfort the rear cylinder bank is deactivated at idle when water temperature exceeds 75°.
Long maintenance intervals
Valve play adjustment (Desmo Service) is required every 24,000 km; services are performed every 12,000 km/12 months.
Ergonomics, more comfort, more control
Compared to the Panigale V4, the riding position - with an above-ground height of 845 mm - has been redefined as per the specifications of a naked model. In keeping with streetfighter culture, the semi-handlebars have been replaced by a high, wide bar that, together with a moderated footpeg position, ensures sports-style comfort during inner city rides and the control needed to tackle country roads or racetracks.
While maintaining many of the Panigale's stylistic features, the tail is supported by a steel subframe and has been redesigned to enhance passenger comfort and give the rider more lengthways space.
The Streetfighter V4 features the Front-Frame - an offshoot of Ducati's extensive experience in MotoGP - which uses the Desmosedici Stradale engine as a load-bearing member.
Compared to traditional perimeter frames the main lay-out difference is that the engine is used as a structural chassis element. Weighing just 4 kg, the compact Front-Frame is attached directly to the upper crankcase of the front cylinder bank and the cylinder head of the rear bank; the V4 crankcase also provides the rear suspension attachment point and the single-sided swingarm pivot mount.
The key advantage of the Ducati Front-Frame is that it uses the Desmosedici Stradale engine to achieve the desired stiffness: this has resulted in significantly lower main frame length and weight and a better stiffness/weight ratio. Moreover, the struts alongside the engine have been shortened, making bike design more compact, especially in the rider's seat area.
Completing the chassis is the under-seat Trellis subframe, attached to the Front-Frame at the top and bolted to the head of the rear cylinder bank below.
The rear suspension linkage mechanism is attached to the Desmosedici Stradale engine via a forged aluminium bracket. The linkage reacts to movements imparted by a cast aluminium high-truss swingarm.
Steering geometry features a 24.5° rake and 100 mm trail.
The Streetfighter V4 mounts 43 mm Showa Big Piston Forks (BPF) to provide full adjustability in spring pre-load and compression and rebound damping.
The fork bodies house chrome sliders with Brembo radial caliper mountings. A Sachs steering damper completes the front-end package. At the rear there is a fully adjustable Sachs shock absorber, one side of which is attached to the Desmosedici Stradale engine via a forged aluminium bracket.
The Streetfighter V4 S, instead, is equipped with an Öhlins NIX-30 fork, an Öhlins TTX36 rear shock absorber and an Öhlins event-based steering damper. On this version suspension and steering damper are controlled by the second-generation Öhlins Smart EC 2.0 system which, among other things, features the new OBTi (Objective Based Tuning Interface).
Wheels and tyres
While the Streetfighter V4 mounts cast aluminium 5-spoke wheels, the V4 S is equipped with 3-spoke Marchesini forged aluminium alloy wheels.
The rims mount Pirelli Diablo Rosso Corsa II tyres. Combining track performance with road versatility, they come in the 120/70 ZR17 (front) and 200/60 ZR 17 (rear) sizes, already used extensively for slick tyres in the FIM Superbike World Championship.
The rear tyre compound has been designed by Pirelli specifically for the Streetfighter V4. It ensures the same dynamic behaviour as the Supercorsa SP race replica tyres mounted on the Panigale V4, but has better low temperature performance to ensure the versatility one expects from a naked.
Braking system with Brembo Stylema® monobloc calipers
The Streetfighter V4 range features powerful Brembo Stylema® monobloc calipers, developed out of the already high performance M50 calipers.
The dual Brembo calipers, each mounting four 30 mm pistons, bite down on 330 mm discs to give exceptional braking power. Rear braking, instead, relies on a single 245 mm disc clamped by a 2-piston caliper. Braking is aided by the ABS Cornering EVO system, which uses the ultra-light 9.1MP control unit.
As on racing bikes, the 16-litre aluminium tank has a section that extends under the seat. Compared to the Panigale V4, the lower section of the tank has been modified to allow installation of a seat with thicker padding to boost rider comfort.
Up front, the space not occupied by fuel has been used to house all the electronics, battery included.
The latest-generation electronics package on the Streetfighter V4 is based on a 6-axis Inertial Measurement Unit (6D IMU) which instantly detects the bike's roll, yaw and pitch angles.
The electronics package has controls for every part of the ride: some oversee start, acceleration and braking, others govern traction and others again lend a helping hand on corners and out-of-the-corner stretches.
- ABS Cornering EVO
- Ducati Traction Control (DTC) EVO 2
- Ducati Slide Control (DSC)
- Ducati Wheelie Control (DWC) EVO
- Ducati Power Launch (DPL)
- Ducati Quick Shift up/down (DQS) EVO 2
- Engine Brake Control (EBC) EVO
- Ducati Electronic Suspension (DES) EVO
Operational parameters for each of these controls are associated by default with the three Streetfighter V4 Riding Modes. Riders can personalise parameters to suit their riding style or restore Ducati factory settings. DTC, DWC, DSC or EBC control levels can be adjusted quickly via the left switchgear.
Second-generation TFT instrumentation
The Streetfighter V4 features the same 5" full-TFT high resolution colour screen (186.59 PPI - 800xRGBx480) as the Panigale V4. The dashboard is dominated by the round virtual rev counter on the right. Desmosedici Stradale revs are displayed on a needle gauge. Movement of the latter is accompanied by a white trail that acts as a 'shift light', changing colour from white to orange and then red as the rev limit approaches.
The rider can call up two different lay-outs: 'Track' highlights the lap times and the rev counter scale makes the revs typical of track use more clearly visible; 'Road', instead, replaces lap times with info on the Ducati Multimedia System (DMS), where present, and the rev scale is more appropriate for road use.