Aprilia RS 125 GP Replica (2025) vs Harley-Davidson Harley Davidson Softail Fat Boy Grey Ghost Limited (2025)
Comparison technical specifications
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| Make: | Aprilia | Harley-Davidson |
| Model: | RS 125 GP Replica | Harley Davidson Softail Fat Boy Grey Ghost Limited |
| Years: | 2025 | 2025 |
| Engine: | Four stroke, single cylinder, DOHC, 4 valves | Four stroke, V-Twin, 2 Milwaukee-Eight 117 custom, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder |
| Capacity: | 124.2 cc / 7.6 cu-in | 1923 cc / 117 cu in |
| Bore x Stroke: | 58 X 47 mm | 103.5 x 114.3 in |
| Cooling System: | Liquid cooled | Air cooled |
| Compression Ratio: | 12.0-12.6 : 1 | 10.3:1 |
| Lubrication: | Wet sump | Pressurized, dry-sump with oil cooler |
| Induction: | ECU Electronics Magneti Marelli MIUG4 32 mm | Electronic Sequential Port Fuel Injection (ESPFI) |
| Ignition: | Electronic with CDI capacity discharge | Single-fire, non-wasted, map-controlled spark ignition |
| Starting: | Electric | Electric |
| Max Power: | 11 kW / 15 hp @ 10500 rpm | 75 kW / 101Hp @ 4800 rpm |
| Max Torque: | 11.4 Nm / 8.4 lb-ft @ 8500 rpm | 165 Nm / 122 lb-ft @ 3000 rpm |
| Clutch: | Multiple discs, in oil bath | Mechanical, 10 plate wet, assist & conventional |
| Transmission: | 6 Speed | 6 Speed |
| Final Drive: | Chain, drive ratio: 13/58 | Belt, 32/66 ratio |
| Gear Ratio: | 1st 11/33 (0.33) 2nd 15/30 (0.50) 3rd 18/27 (0.67) 4th 20/24 (0.83) 5th 25/27 (0.92) 6th 23/22 (1.05) | 1st 9.311 / 2nd 6.454 / 3rd 4.793 / 4th 3.882 / 5th 3.307 / 6th 2.79 |
| Primary Drive: | Straight cut gears, drive ratio: 29/69 | Chain, 34/46 ratio |
| Frame: | Aluminum perimeter frame | Mild steel, tubular frame, rectangular section backbone, stamped, cast, and forged junctions, MIG welded, aluminum forged fender supports |
| Front Suspension: | 40 mm Upside down fork stanchions | Dual bending valve 49mm telescopic with aluminum fork triple clamps, dual rate spring, "beer can" covers |
| Front Wheel Travel: | 110 mm / 4.3 in | 130 mm / 5.1 in |
| Rear Suspension: | Asymmetrical swingarm, monoshock absorber | Hidden, free piston, coil-over monoshock, 43mm stroke, hydraulic preload adjustment |
| Rear Wheel Travel: | 120 mm / 4.7 in | 86 mm / 3.4 in |
| Front Brakes: | Single 300 mm stainless steel disc, 4 pistons radial caliper | 2x 300mm discs, 4 piston fixed caliper |
| Rear Brakes: | Single 218 mm stainless steel disc, single piston calliper. Metal-braided connecting hoses | Single 292mm disc, 2 piston floating caliper |
| ABS: | 2 channel Bosch ABS with anti roll-over system | Standard |
| Wheels: | 6 split spoke wheel rim in lightweight alloy | Machined, Lakester cast aluminum |
| Front Tyre: | 100/80 - 17 | 160/60R18,70V,BW |
| Rear Tyre: | 140/70 ? ZR 17 | 240/40R18,79V,BW |
| Dimensions: | Length: 1968 mm / 77.4 in Width: 760 mm / 29.9 in Height: 1135 mm / 44.6 in | Length 2365 mm / 93.13 in Width 965 mm / 40.0 in |
| Wheelbase: | 1350 mm / 53.1 in | 1650 mm / 65 in |
| Seat Height: | 820 mm / 32.3 in | Unladen 675 mm / 26.6 in Laden 658 mm / 25.9 in |
| Wet Weight: | 144 kg / 317.5 lbs | 314 kg / 694 lbs |
| Fuel Capacity: | 14.5 Litres / 3.8 US gal | 18.9 Litres / US 5.0 gal |