BMW R 100RT (1980-81) vs BMW K1 (1988) vs BMW R 100 (1980-81) vs BMW R850C / R 850 C Avantgarde (1997-)
Comparison technical specifications
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| Make: | BMW | BMW | BMW | BMW |
| Model: | R 100RT | K1 | R 100 | R850C / R 850 C Avantgarde |
| Years: | 1980-81 | 1988 | 1980-81 | 1997- |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder | Four-stroke, horizontal in line four cylinder, DOHC, 4 valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder | Four stroke, two-cylinder, horizontally-opposed Boxer engine, 4 valves per cylinder |
| Capacity: | 980 cc / 59.8 cub in. | 987 cc / 60.2 cu in | 980 cc / 59.8 cu in. | 848 cc / 51.7 cu in. |
| Bore x Stroke: | 94 x 70.6 mm | 67 x 70 mm | 94 x 70.6 mm | 87.5 x 70.5 mm |
| Cooling System: | Air cooled | Liquid cooled | Air cooled | Air/Oil-cooled |
| Compression Ratio: | 9.5:1 | 11.0:1 | 8.2:1 | 10.3:1 |
| Induction: | 2 x Constant depression carburettors, Bing 94/40/105 - 94/40/106 | Electronic injection, Bosch Motronic | 2 x constant depression carburetors, Bing V 94/40/111 - 94/40/112 | Electronic injection, Bosch Motronic |
| Starting: | Electric | Electric | Electric | Electric |
| Max Power: | 51 kW / 70 hp @ 7000 rpm | 72.9 kW / 100 hp @ 8000 rpm (rear tyre: 70.1 k/w / 94.0 hp @ 8400 rpm) | 48.8 kW / 66.6 hp @ 7000 rpm | 36.4 kW / 50 hp @ 5250 rpm |
| Max Torque: | 76 Nm / 7.7 kgf-m / 56 ft-lb @ 6000 rpm | 100 Nm / 10.2 kgf-m / 74 ft lb @ 6750 rpm | 72 Nm / 7.34 kgf-m / 53.1 lb-ft @ 5500 rpm | 71 Nm / 7.2 kgf-m / 52 ft lb @ 4750 rpm |
| Transmission: | 5 Speed | 5 Speed | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Shaft | Shaft | Shaft |
| Front Suspension: | Telescopic fork with hydraulic shock absorber. | Telescopic fork with hydraulic shock absorber | Telescopic fork with hydraulic shock absorber. | Telelever fork with longitudinal control arm and central strut. |
| Rear Suspension: | Long swinging arm with adjustable strut. | Monolayer swinging arm | Long swinging arm with adjustable strut. | Monolever swinging arm |
| Front Brakes: | 2 x ∅260mm discs 2 piston calipers | 2 x ∅305mm discs, 4 piston calipers | Single 260mm disc | 2 x ∅305mm discs, 4 piston calipers |
| Rear Brakes: | Simplex ∅200 mm drum | Single ∅285mm disc, 1 piston caliper | 200 Drum | Single ∅285mm disc, 2 piston caliper |
| Front Tyre: | 3.25 H-19 | 120/70 ZR17 | 3.25 - H19 | 100/90 - 18 |
| Rear Tyre: | 4.00 H-18 | 160/60 ZR18 | 4.00 - H18 | 170/80 - B15 |
| Fuel Capacity: | 24 Litres / 6.3 US gal | 22 L / 5.8 US gal | 24 L / 6.3 US gal | 17 L / 4.4 US gal |