The enthusiasm unleashed by a unique high-revving engine: the essence of the 400cc inline-four
The Ninja ZX-4RR is known as a supersport bike equipped with a unique small-displacement inline-four. Its 399cc water-cooled, four-stroke, parallel-four DOHC engine delivers a maximum output of 57 kW (77 PS) at 14,500 rpm, and at higher revs, it delivers an even more exhilarating feeling with a sharp roar. Its responsiveness at low and mid-range speeds is also refined, making it a versatile bike for both city riding and racing. Its engine design, which transcends the 400cc category and combines high-revving excitement with everyday ease of riding, is the ZX-4R series’ greatest selling point.
Sharp handling thanks to the chassis and suspension inherited from WorldSBK
The chassis, which features a compact diamond frame with a steel tube truss structure, inherits the design philosophy of the WorldSBK machine, the ZX-10RR, and combines sharp cornering characteristics with high feedback performance. The suspension is equipped with Showa SFF-BP inverted forks (with preload adjustment) at the front and a Showa BFRC-lite rear shock absorber, the same as the ZX-10R, at the rear, which firmly supports road feel and off-road performance. With this full-fledged equipment, the ZX-4RR fully demonstrates its agile movements both on city streets and on the circuit.
Evolution of equipment as the highest grade, fusion of driving performance and convenience
The ZX-4RR is positioned as the most fully equipped, top-of-the-line model in its class. Like the SE, it is equipped with a quick shifter (KQS), allowing seamless up and down gear changes without clutch operation. It also comes standard with traction control, an integrated riding mode that combines multiple modes, and a TFT color LCD display, allowing optimal control according to riding conditions. It’s packed with features that ensure high levels of safety and ease of use, including LED lighting, dual disc brakes, and radially mounted monoblock calipers.
New colors to be released in September 2025 ahead of Japan launch
Kawasaki Motors Japan announced on August 4, 2025, that it will update the colors and graphics of both the Ninja ZX-4R SE and Ninja ZX-4RR, with sales commencing on September 1 of the same year. Furthermore, the 2026 model ZX-4RR will be available in two new colors: Rim Lime Green and Metallic Matte Graphene Steal Gray/Metallic Spark Black, and are expected to appear at domestic dealerships from autumn onwards.
These new colors range from the vivid green that is the symbol of the Ninja brand to sophisticated matte colors, and will further highlight the individuality of the ZX-4RR. They will appeal to the combination of high performance and style, and will surely attract the attention of fans.
The ZX-4RR is a true modern super sports bike, combining thrilling high-revving performance with everyday usability and suspension and electronic control equipment comparable to high-end sports models, all within the constraints of the 400cc class. With this new color scheme, its presence has been further enhanced, and it will continue to evolve as a bike that captures the hearts of motorcycle fans.
Main specifications
Maximum power output 57kW (77PS) / 14,500rpm
Maximum power (with ram air pressure) 59kW (80PS) / 14,500rpm
Maximum torque 39N･m (4.0kgf･m) / 13,000rpm
Engine type Water-cooled 4-stroke in-line 4-cylinder
Displacement 399cm³
Bore x stroke 57.0mm x 39.1mm
Compression ratio 12.3:1
Valve type DOHC 4-valve
Fuel supply system Fuel injection (ø34mm x 4)
Ignition system Battery & coil (full transistor ignition)
Starting system Electric starter
Lubrication system Forced lubrication / wet sump
Engine oil capacity 3.0L
Transmission type Constant engagement 6-speed return
Primary reduction ratio 2.029 (69/34)
Gear ratio 1st gear 2.928 (41/14)
Gear ratio 2nd gear 2.055 (37/18)
Gear ratio 3rd gear 1.619 (34/21)
Gear ratio 4th gear 1.333 (32/24)
Gear ratio 5th gear 1.153 (30/26)
Gear ratio 6th gear 1.037 (28/27)
Secondary reduction ratio 3.428 (48/14)
Clutch type Wet multi-plate / manual transmission
Power transmission method Chain
Frame type Trellis (high tensile steel)
Suspension type (front) Telescopic (inverted inner tube diameter 37mm, SFF-BP, compression and rebound damping, spring preload adjustable)
Suspension type (rear) Swing arm (horizontal back link, BFRC lite, compression and rebound damping, spring preload adjustable)
Wheel travel (front) 120mm
Wheel travel (rear) 124mm
Caster 23.5°
Trail 97mm
Steering angle (Left/Right) 35° / 35°
Tire size (Front) 120/70ZR17M/C (58W)
Tire size (Rear) 160/60ZR17M/C (69W)
Brake type (Front) Dual semi-floating disc (outer diameter 290mm)
Caliper (Front) Radial mount monoblock opposed 4-piston
Brake type (Rear) Single disc (outer diameter 220mm)
Caliper (Rear) Single piston
Length x Width x Height 1,990mm x 765mm x 1,110mm
Wheelbase 1,380mm
Ground clearance 135mm
Seat height 800mm
Vehicle weight 189kg
Fuel tank capacity 15L
Fuel used Unleaded regular gasoline
Fuel consumption rate (Ministry of Land, Infrastructure, Transport and Tourism notified value) 24.4km/L (60km/h, constant speed fuel consumption value, with two occupants)
Fuel consumption rate (WMTC mode value) 20.4km/L (Class 3-2, 1 occupant)
Minimum turning radius 2.6m
Seats 2 people
Country of origin Kingdom of Thailand
Model 8BL-ZX400P
Manufacturer’s warranty 2 years
Release date September 1, 2025
Image gallery
