2025 Kawasaki ZX-4RR Specs & Review

Kawasaki’s ZX-4RR is a rare breed: a screaming inline-four in the 400 class with genuine supersport intent. If you’re cross-shopping lightweight sportbikes and want high-rpm thrills, this Kawasaki ZX-4RR review breaks down all the hard numbers. Looking for the 2025 Kawasaki ZX-4RR specs? Here’s what matters.

Key Specs at a Glance

• Engine type: Liquid-cooled, 4-stroke, in-line four (DOHC, 16 valves)
• Displacement: 399 cm³
• Power: 57.0 kW (77 PS) @ 14,500 rpm; up to 58.7 kW (80 PS) with Ram Air
• Torque: 39.0 N•m (28.77 lb-ft) @ 13,000 rpm
• Kawasaki ZX-4RR weight (curb): 189 kg (416.67 lbs)
• Kawasaki ZX-4RR seat height: 800 mm (31.50 in)

Engine & Performance

At 399 cm³ with a 12.3:1 compression ratio and a short-stroke 57.0 mm x 39.1 mm layout, the inline-four is built to rev. Peak output arrives at 14,500 rpm—57.0 kW (77 PS)—or 58.7 kW (80 PS) at the same rpm with Ram Air, so the bike rewards riders who keep it singing near the top. Torque is 39.0 N•m (28.77 lb-ft) at 13,000 rpm, which means roll-on punch is best when you’re a gear or two down and the tach is awake.

In the city, the fuel injection (34 mm x 4) and digital ignition keep response clean and predictable. On the highway, the 6-speed, return-shift gearbox pairs a 2.029 primary reduction with a close spread (1st: 2.929 to 6th: 1.037) and a 3.429 final reduction, giving you the flexibility to settle into traffic or drop a gear for a swift pass. Fun riding is the sweet spot: let it spin, and the ZX-4RR delivers that classic inline-four shriek with meaningful top-end thrust.

Handling, Comfort & Kawasaki ZX-4RR Seat Height

The Kawasaki ZX-4RR seat height is 800 mm (31.50 in), a neutral middle ground that suits a wide range of riders. Combined with a curb mass of 189 kg (416.67 lbs), low-speed maneuvering is manageable, and the generous 35° steering angle each side helps with tight U-turns and parking-lot agility. Shorter riders may appreciate the predictable balance; taller riders will find enough room without feeling perched.

Geometry is sport-friendly yet approachable: a 1,380 mm (54.33 in) wheelbase and 97 mm (3.82 in) trail promote quick direction changes while maintaining straight-line stability. Ground clearance sits at 135 mm (5.31 in), and the bike rolls on a proven 17-inch combo—120/70 ZR17 front and 160/60 ZR17 rear—for confident side grip and responsive turn-in.

Equipment & Features

• Frame: Trellis, high-tensile steel for a taut, communicative chassis.
• Brakes: Dual semi-floating front discs (Ø 290 mm) with radial-mount, monobloc, opposed 4-piston calipers deliver strong initial bite and consistent power; rear is a single disc (Ø 220 mm) with a single-piston caliper.
• Suspension: The listed front setup is a Single A-Arm with twin shock absorbers (Ø 37 mm), while the rear is a Horizontal Back-link BFRC lite gas-charged shock with a piggyback reservoir. The rear offers compression and rebound damping, spring preload adjustability, and a top-out spring. Wheel travel is 120 mm front and 124 mm rear.
• Drivetrain: 6-speed, return shift with a wet, multi disc clutch and sealed chain final drive.
• Fuel & emissions: Fuel capacity is 15.0 litres (3.96 gal). Rated consumption is 5.1 l/100km (46.1 mpg) and CO₂ emissions are 120 g/km.
• Electronics listed: Electric starting and digital ignition; additional rider aids are not specified in the provided data.

Who Is the 2025 Kawasaki ZX-4RR For?

Riders who crave a compact supersport with a true inline-four character will love this bike. It suits weekend canyon runs, track days, and spirited commuting. With a manageable 800 mm seat height and predictable fueling, confident novices could grow into it, though its peakier delivery and rev-hungry nature will be best appreciated by riders with some experience.

If your priorities are daily practicality, the rated 5.1 l/100km (46.1 mpg) and 15.0-litre tank help keep stops down. If your priority is performance, the high-rpm powerband, robust front brakes, and adjustable rear shock lean toward playful riding and learning proper corner speed.

Torquepedia Verdict

The 2025 Kawasaki ZX-4RR stands out on spec alone: a 399 cm³ inline-four that revs to 14,500 rpm and delivers 77 PS (80 PS with Ram Air) is a rarity today. Strong front stoppers, a trellis frame, and an adjustable BFRC lite rear shock add serious credibility for track-curious riders. As a package, the chassis geometry and tire sizing promise quick steering without sacrificing stability.

On the flip side, the Kawasaki ZX-4RR weight of 189 kg and a torque peak at 13,000 rpm mean you’ll get the best from it when you keep it on the boil. If that sounds like your kind of riding, the 2025 Kawasaki ZX-4RR specs paint a compelling picture of a focused, high-revving sport machine that punches above its class for rider involvement.

FAQ

• Is the 2025 Kawasaki ZX-4RR good for beginners?

  • It’s manageable and well-fueled, but its 77 PS (80 PS with Ram Air) high-rev character suits riders with at least some experience. Confident beginners could grow into it.

• What is the seat height of the 2025 Kawasaki ZX-4RR?

  • 800 mm (31.50 in).

• How heavy is the 2025 Kawasaki ZX-4RR?

  • Kawasaki ZX-4RR weight (curb): 189 kg (416.67 lbs).

• What is the power output?

  • 57.0 kW (77 PS) at 14,500 rpm, or 58.7 kW (80 PS) with Ram Air at 14,500 rpm.

• What tire sizes does it use?

  • Front: 120/70 ZR17 M/C (58W); Rear: 160/60 ZR17 M/C (69W).