BMW R 68 SDT Special (1952-55) vs BMW R 50 US (1967-69) vs Hyosung GT 650S (2009-11)
Comparison technical specifications
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| Make: | BMW | BMW | Hyosung |
| Model: | R 68 SDT Special | R 50 US | GT 650S |
| Years: | 1952-55 | 1967-69 | 2009-11 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Four stroke, 90° V twin, DOHC, 4 valve per cylinder |
| Capacity: | 594 cc / 36.2 cu in | 494 cc / 30.1 cu in. | 647 cc / 39.4 cu-in |
| Bore x Stroke: | 72 x 73 mm | 68 x 68 mm | 81.5 x 62 mm |
| Compression Ratio: | 8.0:1 | 7.5:1 | 11.4:1 |
| Cooling System: | Air cooled | Air cooled | Liquid cooled |
| Induction: | 2 x Bing 1/26/9 - 1/26/10 carburetors | 2 x Bing 1/24/45 - 1/24/46 carburetors | Electronic fuel Injection |
| Ignition: | Magneto ignition | Battery ignition | Digital CDI |
| Starting: | Kick | Electric & kick | Electric |
| Clutch: | Single plate, dry | Single plate saucer spring, dry | Wet, multiple discs, cable operated |
| Max Power: | 26.1 kW / 35 hp @ 7000 rpm | 19.4 kW / 26 hp @ 5800 rpm | 76.4 hp / 58.8 kW @ 9000 rpm |
| Transmission: | 4 Speed | 4 Speed | 6 Speed |
| Final Drive: | Shaft | Shaft | Chain |
| Frame: | Double loop steel tubular frame | Double loop steel tubular frame | Steel, double pipe |
| Front Suspension: | Telescopic front fork with hydraulic damping; plunger type | Telescopic fork | 41mm Oil upside down forks |
| Rear Suspension: | Spring with coil compression springs and rubber deflection stops | Long swing arm with suspension units and oil pressure shock absorbers | Swinging arm |
| Front Brakes: | ∅200mm Drum duplex full hub | ∅200mm Drum, duplex full hub | 2x 300mm discs |
| Rear Brakes: | ∅200mm Drum simplex full hub | ∅200mm Drum, simplex full hub | Single 230mm disc |
| Front Tyre: | 3.50 - 19" | 3.50 -18" | 120/60 -17 |
| Rear Tyre: | 3.50 - 19" | 4.00 -18" | 160/60 -17 |
| Wet-Weight: | 190 kg / 422 lb | 195 kg / 429 lbs | 210 kg / 462 lbs |
| Fuel Capacity: | 17 liters / 4.4 US gal | 17 liters / 4.49 US gal | 17 Litres / 3.1 US gal |