BMW R 68 SDT Special (1952-55) vs BMW R 50 US (1967-69)
Comparison technical specifications
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| Make: | BMW | BMW |
| Model: | R 68 SDT Special | R 50 US |
| Years: | 1952-55 | 1967-69 |
| 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. |
| Capacity: | 594 cc / 36.2 cu in | 494 cc / 30.1 cu in. |
| Bore x Stroke: | 72 x 73 mm | 68 x 68 mm |
| Compression Ratio: | 8.0:1 | 7.5:1 |
| Cooling System: | Air cooled | Air cooled |
| Induction: | 2 x Bing 1/26/9 - 1/26/10 carburetors | 2 x Bing 1/24/45 - 1/24/46 carburetors |
| Ignition: | Magneto ignition | Battery ignition |
| Starting: | Kick | Electric & kick |
| Clutch: | Single plate, dry | Single plate saucer spring, dry |
| Max Power: | 26.1 kW / 35 hp @ 7000 rpm | 19.4 kW / 26 hp @ 5800 rpm |
| Transmission: | 4 Speed | 4 Speed |
| Final Drive: | Shaft | Shaft |
| Gear Ratio: | 1st 4.00 / 2nd 2.28 / 3rd 1.7 / 4th 1.3 | 1st 4.17 / 2nd 2.73 / 3rd 1.95 / 4th 1.54:1 |
| Frame: | Double loop steel tubular frame | Double loop steel tubular frame |
| Front Suspension: | Telescopic front fork with hydraulic damping; plunger type | Telescopic fork |
| Rear Suspension: | Spring with coil compression springs and rubber deflection stops | Long swing arm with suspension units and oil pressure shock absorbers |
| Front Brakes: | ∅200mm Drum duplex full hub | ∅200mm Drum, duplex full hub |
| Rear Brakes: | ∅200mm Drum simplex full hub | ∅200mm Drum, simplex full hub |
| Front Tyre: | 3.50 - 19" | 3.50 -18" |
| Rear Tyre: | 3.50 - 19" | 4.00 -18" |
| Wet-Weight: | 190 kg / 422 lb | 195 kg / 429 lbs |
| Fuel Capacity: | 17 liters / 4.4 US gal | 17 liters / 4.49 US gal |