Ducati Monster S4RS Testastretta (2008) vs BMW R 20 (1938-40)
Comparison technical specifications
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| Make: | Ducati | BMW |
| Model: | Monster S4RS Testastretta | R 20 |
| Years: | 2008 | 1938-40 |
| Engine: | Four stroke, 90° “L” twin cylinder, DOHC, desmodromic 4 valves per cylinder | Four stroke, single cylinder, pushrod operated, OHV, 2 valves per cylinder. |
| Capacity: | 998 cc / 60.9 cu in | 192 cc / 11.7 cu in. |
| Bore x Stroke: | 100 x 63.5 mm | 68 x 68 mm |
| Cooling System: | Liquid cooled | Air cooled |
| Compression Ratio: | 11.4:1 | 6.0:1 |
| Induction: | Marelli electronic fuel injection, 50 mm throttle bodies | 1 x Amal push in carburetor M 74/428 |
| Ignition: | Marelli Electronic | Battery ignition |
| Starting: | Electric | Kick |
| Max Power: | 95.7 kW / 130 hp @ 9500 rpm | 6 kW / 8 hp @ 5400 rpm |
| Clutch: | Dry multiplate with hydraulic control | Single plate, dry |
| Transmission: | 6 Speed | 3 Speed |
| Final Drive: | Chain; front sprocket 15; rear sprocket 42 | Shaft |
| Gear Ratio: | 1st 37/15, 2nd 30/17, 3rd 27/20, 4th 24/22, 5th 23/24, 6th 24/28 | 1st 4.55 / 2nd 2.58 / 3rd 1.64:1 |
| Frame: | Tubular steel Trellis frame | Twin loop frame, bolted |
| Front Suspension: | Öhlins 43 mm upside-down fully adjustable fork with TiN surface treatment | Telescopic fork |
| Rear Suspension: | Progressive linkage with fully adjustable Öhlins monoshock. Aluminium single-sided swingarm | Rigid, spring loaded saddle |
| Rear Brakes: | Single 245 mm disc, 2 piston caliper | ∅180mm Drum |
| Front Tyre: | 120/70 ZR17 | 3.00 x 19" |
| Rear Tyre: | 180/55 ZR17 | 3.00 x 19" |