Vespa 125 GT/Sprint, GTR, TS, Primavera ET3, P125X (1966-73) vs KTM RC 390 (2014-15) vs Vespa 50 Allungata (1967-71) vs KTM 690 Duke (2014)
Comparison technical specifications
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| Make: | Vespa | KTM | Vespa | KTM |
| Model: | 125 GT/Sprint, GTR, TS, Primavera ET3, P125X | RC 390 | 50 Allungata | 690 Duke |
| Years: | 1966-73 | 2014-15 | 1967-71 | 2014 |
| Engine: | Two stroke, single cylinder | Four stroke, single cylinder. DOHC with finger followers, 4 Valve per cylinder | Two stroke, single cylinder | Four stroke, single cylinder, SOHC, 4 valves |
| Capacity: | 121.2 cc / 7.4 cub in | 373 cc / 22.7 cu-in | 49.8 cc / 3.0 cub in | 690 cc / 42.1 cu in |
| Bore x Stroke: | 52.5 x 57 mm | 89 x 60 mm | 38.4 x 43 mm | 102 x 84.5 mm |
| Starting: | Kick start | Electric | Kick start | Electric |
| Clutch: | Multiplate | Wet multi-disc clutch / mechanically operated | Multi plate | APTC multi-disc wet clutch, hydraulically operated |
| Max Power: | 3.4 kW / 4.6 hp | 32 kW / 43 hp @ 9500 rpm | 1.9 kW / 2.6 Hp @ 4500 rpm | 52.2 kW / 70 hp @ 7500 rpm |
| Transmission: | 4 Speed, grip-shift, constant mesh | 5 Speed | 3 Speed | 6 Speed |
| Final Drive: | Direct drive | Chain 5/8 x 1/4” X‑Ring | Direct drive | Chain X-Ring 5/8 x 5/16" |
| Frame: | Pressed sheet steel, streamlined monocoque structure | Tubular space frame made from steel, powder-coated | Sheet metal, welded support | Chromoly trellis frame, powder-coated, aluminium sub frame |
| Front Suspension: | Elastic with coil spring and hydraulic shock | WP Suspension Up Side Down | Hydraulic shock absorber with rubber elements | WP Upside-down forks, 4357 ROMA |
| Rear Suspension: | Elastic with coil spring and hydraulic shock | WP Monoshock | Hydraulic shock absorber | WP monoshock, 4618 with Pro-lever deflector |
| Front Brakes: | Drum | Single 300 mm disc 4 piston radial caliper | Drum | Single 320 mm floating disc, radially screwed four-piston brake caliper |
| Rear Brakes: | Drum | Single 230 mm disc 1 piston caliper | Drum | Single 240 mm floating disc, single piston caliper |
| Front Tyre: | 3.0 x 10" | 110/70 R17 | 2.75 x 9" | 120/70 - ZR17 M/C 58W TL |
| Rear Tyre: | 3.0 x 10" | 150/60 R17 | 2.75 x 9" | 160/60 - ZR17 M/C 69W TL |
| Dry Weight: | 73 kg / 161 lbs | 139 kg / 306.4 lbs | 67 kg / 148 lbs | 149.5 kg / 330 in |
| Fuel Capacity: | 5.5 L / 1.5 US gal | 10 Liters / 2.64 lbs | 5.6 L / 1.5 US gal | 14 Litres / 3.7 US gal / 3.1 Imp gal |