BMW R 4 (1932-37) vs BMW K 100RS ABS (1988)
Comparison technical specifications
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| Make: | BMW | BMW |
| Model: | R 4 | K 100RS ABS |
| Years: | 1932-37 | 1988 |
| Engine: | Four stroke, single cylinder vertical | Four stroke, horizontal in line four cylinder, DOHC, 2 valves per cylinder |
| Capacity: | 498 cc / 30.4 cu in. | 987 cc / 60.2 cub. in |
| Bore x Stroke: | 84 x 78 mm | 67 x 70 mm |
| Compression Ratio: | 5.7:1 | 10.2:1 |
| Cooling System: | Air cooled | Liquid cooled |
| Induction: | 1 x carburetor type SUM CK 3/500 Fr | Electronic injection, Bosch LE-Jetronic |
| Ignition: | Battery ignition | Electronic injection, Bosch LE-Jetronic |
| Starting: | Kick | Electric |
| Clutch: | Single plate, dry | Dry, single plate, cable operated |
| Max Power: | 10.4 kW / 14hp @ 4000 rpm | 65.6 kW / 90 hp @ 8000 rpm |
| Transmission: | 4 Speed | 5 Speed |
| Final Drive: | Shaft | Shaft |
| Gear Ratio: | 1st 3.6 / 2nd 2.28 / 3rd 1.70 / 4th 1.30:1 | 1st 4.50 / 2nd 2.96 / 3rd 2.30 / 4th 1.88 / 5th 1.61:1 |
| Frame: | Pressed steel duplex frame | Tubular space frame, engine serving as load bearing component |
| Front Suspension: | Plate spring, 9 laminae with 2 friction shock absorbers | Telescopic fork with hydraulic shock absorber |
| Rear Suspension: | Rigid, sping loaded saddle | Monolever swinging arm |
| Rear Brakes: | ∅160mm Drum | Single ∅285 mm disc, 1 piston caliper, ABS |
| Front Tyre: | 3.50 x 26" SS | 100/90-V18 |
| Rear Tyre: | 3.50 x 26" SS | 130/90-V17 |
| Wet-Weight: | 137 kg / 302 lbs | 249 kg / 548 lbs |
| Fuel Capacity: | 12 L / 3.2 US gal | 22 Liters / 5.8 US gal |