Aprilia RS 125 GP Replica (2025) vs Triumph Speed Twin 1200 Caf? Racer (2026) vs Kawasaki Z 650S (2026)
Comparison technical specifications
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| Make: | Aprilia | Triumph | Kawasaki |
| Model: | RS 125 GP Replica | Speed Twin 1200 Caf? Racer | Z 650S |
| Years: | 2025 | 2026 | 2026 |
| Engine: | Four stroke, single cylinder, DOHC, 4 valves | Four stoke, parallel twin, 270? crank, SOHC, 4 valve per cylinder | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 124.2 cc / 7.6 cu-in | 1198 cc / 73.1 cu-in | 649 cc / 39.65 cu-in |
| Bore x Stroke: | 58 X 47 mm | 97.6 x 80 mm | 83 x 60 mm |
| Cooling System: | Liquid cooled | Liquid cooled | Liquid cooled |
| Compression Ratio: | 12.0-12.6 : 1 | 12.1:1 | 10.8:1 |
| Lubrication: | Wet sump | Wet sump | Forced lubrication, semi‑dry sump |
| Emission: | EURO5 | Euro 5+ | EURO5 |
| Induction: | ECU Electronics Magneti Marelli MIUG4 32 mm | Multipoint sequential electronic fuel injection with electronic throttle control | EFI |
| Ignition: | Electronic with CDI capacity discharge | Digital | TCBI with electronic advance |
| Starting: | Electric | Electric | Electric |
| Max Power: | 11 kW / 15 hp @ 10500 rpm | 77.2 kW / 103.5 hp @ 7750 rpm | 50.2 kW / 67.3 hp @ 8000 rpm |
| Max Torque: | 11.4 Nm / 8.4 lb-ft @ 8500 rpm | 112 Nm / 82.6 lb-ft @ 4250 rpm | 64 Nm / 47.2 lb-ft @ 6700 rpm |
| Clutch: | Multiple discs, in oil bath | Wet, multi-plate slip & assist clutch | Wet multi-disc, manual |
| Transmission: | 6 Speed | 6-Speed | 6 Speed, return |
| Final Drive: | Chain, drive ratio: 13/58 | Chain, X-ring | Sealed chain |
| Frame: | Aluminum perimeter frame | Tubular steel with steel cradles | Trellis, high-tensile steel |
| Front Suspension: | 40 mm Upside down fork stanchions | 43mm USD Marzocchi forks, adjustable for pre-load, compression and rebound damping | 41 mm hydraulic telescopic fork |
| Front Wheel Travel: | 110 mm / 4.3 in | 120 mm / 4.7 in | 125 mm / 4.9 in |
| Rear Suspension: | Asymmetrical swingarm, monoshock absorber | Twin ?hlins RSUs with external reservoirs, adjustable for pre-load, compression and rebound | Horizontal back-link with adjustable preload swingarm |
| Rear Wheel Travel: | 120 mm / 4.7 in | 123 mm / 4.8 in | 130 mm / 5.1 in |
| Front Brakes: | Single 300 mm stainless steel disc, 4 pistons radial caliper | 2 x 320 mm discs, Brembo Stylema M4.30 radial calipers | 2 x 300mm discs, 2 piston calipers |
| Rear Brakes: | Single 218 mm stainless steel disc, single piston calliper. Metal-braided connecting hoses | Single 220 mm disc, Nissin 2-piston floating caliper | Single 220mm disc, 1 piston caliper |
| ABS: | 2 channel Bosch ABS with anti roll-over system | Standard, OCABS | Bosch advanced |
| Front Tyre: | 100/80 - 17 | 120/70 ZR17 | 120/70ZR17M/C (58W) |
| Rear Tyre: | 140/70 ? ZR 17 | 160/60 ZR17 | 160/60ZR17M/C (69W) |
| Dimensions: | Length: 1968 mm / 77.4 in Width: 760 mm / 29.9 in Height: 1135 mm / 44.6 in | Length: 2073 mm / 81.6 in Width: 792 mm / 31.2 in Height: 1043 mm / 41.1 in | Length 2055 mm / 80.9 in Width 765 mm / 30.1 in Height 1065 mm / 41.9 in |
| Wheelbase: | 1350 mm / 53.1 in | 1400 mm / 55.1 in | 1410 mm / 55.5 in |
| Seat Height: | 820 mm / 32.3 in | 803 mm / 31.6 in | 790 mm / 31.1 in |
| Wet Weight: | 144 kg / 317.5 lbs | 217 kg / 478.4 lbs | 188 kg / 414 lbs |
| Fuel Capacity: | 14.5 Litres / 3.8 US gal | 14.5 Litres / 3.8 US gal | 15 Litres / 4.0 US gal |