BMW R 20 (1938-40) vs BMW R 100R Classic (1995)
Comparison technical specifications
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| Make: | BMW | BMW |
| Model: | R 20 | R 100R Classic |
| Years: | 1938-40 | 1995 |
| Engine: | Four stroke, single cylinder, pushrod operated, OHV, 2 valves per cylinder. | Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder. |
| Capacity: | 192 cc / 11.7 cu in. | 980 cc / 59.8 cub in. |
| Bore x Stroke: | 68 x 68 mm | 94 x 70.6 mm |
| Compression Ratio: | 6.0:1 | 8.5:1 |
| Cooling System: | Air cooled | Air/oil cooled |
| Induction: | 1 x Amal push in carburetor M 74/428 | 2 Constant depression carburettors, Bing 94/40/123 - 94/40/124 |
| Ignition: | Battery ignition | Contact free electronic ignition (Bosch) |
| Starting: | Kick | Electric |
| Clutch: | Single plate, dry | Dry single plate, with lever action diaphragm spring |
| Max Power: | 6 kW / 8 hp @ 5400 rpm | 44 KW / 60 hp @ 6500 rpm |
| Transmission: | 3 Speed | 5 Speed |
| Final Drive: | Shaft | Shaft |
| Gear Ratio: | 1st 4.55 / 2nd 2.58 / 3rd 1.64:1 | 1st 4.40 / 2nd 2.86 / 3rd 2.07 / 4th 1.67 / 5th 1.50:1 |
| Frame: | Twin loop frame, bolted | Double loop tubular frame with bolt on rear section |
| Front Suspension: | Telescopic fork | Telescopic fork with hydraulic shock absorber, Showa, ∅41 mm |
| Rear Suspension: | Rigid, spring loaded saddle | Paralever swinging arm, single shock, Showa, adjustable for rebound damping |
| Rear Brakes: | ∅180mm Drum | Single ∅200mm disc |
| Front Tyre: | 3.00 x 19" | 110 / 80 V18, Metzeler ME33 Lazer |
| Rear Tyre: | 3.00 x 19" | 140 / 80 V 17, Metzeler ME55A Metronic |
| Wet-Weight: | 130 kg / 296 lb | 213 kg / 469 lbs |
| Fuel Capacity: | 12 L / 3.2 US gal | 22 Litres / 5.7 US gal |