KAWASAKI Z900RS vs KAWASAKI Ninja ZX-4RR
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Scores, summary & seat (optional) Estimates and auto text from specs — open if you want them.
Technical score (estimate)
Weighted mix of power, torque, power-to-weight, top speed and lighter weight within this comparison only. Not a real-world verdict — riding style and roads matter.
Usage fit (estimate)
Rough scores for city riding, touring, sporty riding and new riders — mix of specs and bike category. Same caveats as the technical score: traffic, skill and tyres matter.
City / commute
Touring / long rides
Sporty riding
New rider friendly
Seat height (cm)
Figures are as in the database; boots, suspension sag and road surface change how tall the bike feels.
- KAWASAKI Z900RS 83.5 cm Tallest seat here
- KAWASAKI Ninja ZX-4RR 80 cm Lowest seat here
Spread in this comparison: about 3.5 cm.
Rough guide: comfortable flat-foot reach often needs inseam roughly in the same ballpark as seat height (varies a lot by ergonomics).
Auto summary from specs
Generated from the numbers in the comparison — not a review.
- Power spans 79.1 hp (KAWASAKI Ninja ZX-4RR) up to 111 hp (KAWASAKI Z900RS).
- Torque spans 76.4 Nm (KAWASAKI Ninja ZX-4RR) up to 98.5 Nm (KAWASAKI Z900RS).
- Weight spans 188 kg (KAWASAKI Ninja ZX-4RR) to 215 kg (KAWASAKI Z900RS).
- Displacement spans 400 cc (KAWASAKI Ninja ZX-4RR) to 900 cc (KAWASAKI Z900RS).
Reader votes so far — total 1: KAWASAKI Z900RS (0); KAWASAKI Ninja ZX-4RR (1).
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| Specification | KAWASAKI Z900RS | KAWASAKI Ninja ZX-4RR |
|---|---|---|
| Brand | KAWASAKI | KAWASAKI |
| Model | KAWASAKI Z900RS | KAWASAKI Ninja ZX-4RR |
| Engine size | 900cc | 400cc |
| Power | 111hp | 79.1hp |
| Torque | 98.5nm. | 76.4nm. |
| Cylinders / valves | 4 cylinders, 16 valves | 4 cylinders, 16 valves |
| Weight | 215kg | 188kg |
| Front brake | 300 mm dual discs, radially mounted, monoblock 4-piston caliper | Twin 290 mm discs, ABS |
| Rear brake | 250 mm single disc, single-piston caliper | Single 220 mm disc, ABS |
| Seat height (cm) | 83.5cm | 80cm |
| Front tyre | 120/70ZR17 | 110/70-17 |
| Rear tyre | 180/55R17 | 150/60-17 |
| Cooling | Liquid cooling | Liquid cooling |
| Front suspension | 41 mm inverted fork, continuously adjustable compression and rebound damping, spring preload adjustable | SFF-BP internal parts and adjustable spring preload/4.7 inches, 37 mm inverted fork |
| Rear suspension | Horizontal back-link, continuously adjustable rebound damping, spring preload, and preload adjustability | Horizontal Back-link, BFRC lite gas-charged shock with piggyback reservoir, adjustable compression, rebound, and spring preload/4.9 inches |
| Motorcycle type | Naked | Supersport |
| Top speed | 235km/h | 235km/h |
| Fuel capacity / consumption | 17 L – 7 L/100km | 15 L – 6 L/100km |
| Service network | ||
| Service quality | ||
| Parts availability | ||
| Price | $12149 | $9399 |
| Brand price lists | View KAWASAKI price list | View KAWASAKI price list |
| Extra features | -Slipper Clutch -KTRC (2 MODES) -Economical Riding Indicator -Dual Throttle Valves |
Electronic Riding Aids Economical Riding Indicator, Kawasaki Traction Control (KTRC) (3 modes), Kawasaki Quick Shifter (KQS) (dual-direction), Power Modes Special Features 4.3" Full-color TFT Display, Smartphone Connectivity via RIDEOLOGY THE APP -Power Modes -Smartphone Connectivity -Horizontal Back-link Rear Suspension |
Opinions
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2023 KAWASAKI Z900RS vs 2023 KAWASAKI Ninja ZX-4RR: listed specifications
The 2023 KAWASAKI Z900RS and 2023 KAWASAKI Ninja ZX-4RR differ on the listed specifications: the Z900RS has more displacement, peak power and torque, and the Ninja ZX-4RR has a lower listed weight.
Engine displacement
Z900RS has a clearly larger listed engine displacement (900 cc vs 400 cc).
Peak power
Z900RS has a clear listed power advantage (111 hp vs 79.1 hp).
Torque
Z900RS has a clear listed torque advantage (98.5 Nm vs 76.4 Nm).
Listed top speed
Z900RS and Ninja ZX-4RR have very similar listed top speeds (235 km/h vs 235 km/h).
Cooling
Both motorcycles are listed as liquid-cooled.
Weight and seat height
Ninja ZX-4RR is notably lighter on the listed weight (188 kg vs 215 kg). There is a noticeable listed seat-height difference: Z900RS is listed higher (83.5 cm) than Ninja ZX-4RR (80 cm).
Conclusion
The measurable differences are therefore concentrated in displacement, peak power, torque, weight and seat height, while listed top speed remains relatively close.
Frequently asked questions
What is the top speed of KAWASAKI Z900RS vs KAWASAKI Ninja ZX-4RR?
Both are listed at 235 km/h (146 mph) top speed in our specification data.
Which has more horsepower, KAWASAKI Z900RS or KAWASAKI Ninja ZX-4RR?
KAWASAKI Z900RS has 111 hp compared with 79 hp on the KAWASAKI Ninja ZX-4RR.
Which is lighter, KAWASAKI Z900RS or KAWASAKI Ninja ZX-4RR?
KAWASAKI Ninja ZX-4RR is lighter at 188 kg vs 215 kg for KAWASAKI Z900RS.
Which is better, KAWASAKI Z900RS or KAWASAKI Ninja ZX-4RR?
It depends on your riding style. Compare top speed, weight, fuel use and price in the table on this page, then vote for the bike you prefer.
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