Yamaha DT 175 (1974-75) vs Hyosung XRX 125 (2005) vs Hyosung RX 450SM (2008) vs Hyosung ST7 (2015-16)
Comparison technical specifications
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| Make: | Yamaha | Hyosung | Hyosung | Hyosung |
| Model: | DT 175 | XRX 125 | RX 450SM | ST7 |
| Years: | 1974-75 | 2005 | 2008 | 2015-16 |
| Engine: | Two stroke, single cylinder, reed valve | Four stroke, single cylinder | Four stroke, Single cylinder | Four stroke, 90° V twin, DOHC, 4 valve per cylinder. |
| Capacity: | 171 cc / 10.43 cu-in | 124 cc / 7.6 cu-in | 450 cc / 27.4 cu-in | 647 cc / 39.4 cu-in |
| Bore x Stroke: | 66 x 50 mm | 57 x 48.8 mm | 81.5 x 62 mm | |
| Compression Ratio: | 6.8;1 | 9.8;1 | 11.6:1 | |
| Induction: | Mikuni VM24SS 24mm slide type carburettor | Sung Lim PD | Electronic fuel injection | Fuel injection |
| Ignition: | CDI, magneto type | Electronic | CDI | Digital CDI |
| Starting: | Kick | Electric & kick | Electric | Electric |
| Max Power: | 16.5 hp / 12.3 kW @ 7000 rpm | 12 hp / 8.9 kW @ 8500 rpm | 50 hp @ 8500rpm | 47 kW / 63 hp @ 8250rpm |
| Max Torque: | 8.8 Nm / 12 lb- ft @ 6000rpm. | 9.9 Nm / 7.3 lb-ft @ 7500 rpm | 58 Nm / 42.7 lb-ft @ 7500rpm | |
| Transmission: | 5 Speed | 5 Speed | 6 Speed | 6 Speed |
| Final Drive: | Chain, DID428SM. 117 links. | Chain | Chain | Belt |
| Front Suspension: | Telescopic, oil damped. | Upside down telescopic fork, 250mm wheel travel | 45mm upside-down forks | 41mm Conventional |
| Rear Suspension: | Dual shocks | Swingarm, 200mm wheel travel | Fully-adjustable rear monoshock | Suspension Dual shock / adjustable preload |
| Front Brakes: | Drum | Single 240mm disc | Single 260mm disc | 2x 300mm discs |
| Rear Brakes: | Drum | 130mm drum | Single 250mm disc | Single 230mm disc |
| Front Tyre: | 2.75 -21 | 2.75-21 | 120 / 60 R17 | 120/80 -16 |
| Rear Tyre: | 3.50 -18 | 4.10-18 | 180/55 ZR17 | 170/80 -15 |
| Dry Weight: | 99 kg / 2181 lbs | 127 kg / 280 lbs | 120 kg / 264.5 lbs | 229 kg / 504 lbs |
| Fuel Capacity: | 7 Litres / 1.5gal | 8 Litres / 2 US gal | 15 Litres / 3.9 US gal | 17 Litres / 4.5 US gal |