BMW R 1250RT (2020) vs BMW R 1100RT (1997-98) vs BMW K 1200RS (1997-98) vs BMW R 1100GS (1997) vs BMW R 80G/S (1980)
Comparison technical specifications
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| Make: | BMW | BMW | BMW | BMW | BMW |
| Model: | R 1250RT | R 1100RT | K 1200RS | R 1100GS | R 80G/S |
| Years: | 2020 | 1997-98 | 1997-98 | 1997 | 1980 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, with two overhead, spur gear driven camshafts , a counterbalance shaft and variable intake camshaft control system BMW ShiftCam, 4 valves per cylinder, Intake 40mm, outlet 34 mm | Four stroke, two cylinder horizontally opposed Boxer, 4 valves per cylinder | Four stroke, horizontal in line four cylinder, DOHC, 4 valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, 4 valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. |
| Capacity: | 1254 cc / 76.5 cu-in | 1085 cc / 66.2 cu in | 1171 cc / 71.4 cu in | 1084 cc / 66.1 cu in | 797.5 cc / 48.7 cu in. |
| Bore x Stroke: | 102.5 x 76 mm | 99 x 70.5 mm | 70.5 x 75 mm | 99 x 70.5 mm | 84.8 x 70.6 mm |
| Compression Ratio: | 12.5:1 | 10.7:1 | 11.5:1 | 10.3:1 | 9.2:1 |
| Cooling System: | Liquid / Air cooled | Air/Oil cooled | Liquid cooled | Air/oil-cooled | Air cooled |
| Induction: | Electronic intake pipe injection, 52mm Ø throttle valve | Fuel injection | Electronic intake pipe injection | Bosch Motronic 2.2 with fuel cutoff when coasting | 2 x Bing constant depression carburetorss |
| Starting: | Electric | Electric | Electric | Electric | Electric & Kick |
| Max Power: | 136 hp / 100 kW @ 7750 rpm | 67.1 kW / 90 hp @ 7250 rpm | 97 kW / 130 hp @ 8750 rpm | 59 kW / 80 hp @ 6750 rpm | 37 kW / 50 hp @ 6500 rpm |
| Max Torque: | 143 Nm / 105.4 lb-ft @ 6250 rpm | 95 Nm / 9.7 kgf-m / 69 lb-ft.@ 5500 rpm | 115 Nm / 11.7 kgf-m / 85 lb-ft @ 6750 rpm | 97Nm / 9.9 kgf-m / 71 lb-ft / @ 5250 rpm | 56.7 Nm / 5.8 kgf-m / 41 ft lb @ 5000 rpm |
| Clutch: | Wet clutch with anti-hopping function, hydraulically activated | Dry, single plate, cable operated | Single-disc dry clutch, hydraulically operated | ∅180mm Dry single plate with diaphram spring | Dry single plate, with diaphragm spring |
| Transmission: | Constant mesh 6-speed gearbox with helical gearing system | 5 Speed | 6 Speed | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Shaft | Shaft | Shaft | Shaft |
| Frame: | Two-section frame concept consisting of main frame with bolt-on rear frame, load-bearing engine | Steel, backbone frame | Bridging frame consisting of die-cast aluminium, engine decoupled from vibration through bearings | Three piece (front and rear sections with load-bearing engine) | Double loop tubular frame with bolt on rear section |
| Front Suspension: | BMW Motorrad 37mm Telelever, central spring strut | Telelever with central spring strut & linear-rate coil spring. Twin-tube gas-filled shock | Telelever, stanchion diameter ∅35 mm, central strut | BMW Telelever Single gas-filled shock absorber with progressive coil spring, Preload adjustment (five steps) | Telescopic hydraulic forks |
| Rear Suspension: | Cast aluminium single-sided swing arm with BMW Motorrad Paralever, WAD spring strut, continuously adjustable spring preload by means of hand wheel, rebound-stage damping adjustable by hand wheel (Option: Dynamic ESA) | Paralever swingarm & shaft drive, single-tube gas-filled shock, variable rebound setting | Die cast aluminium single sided swinging arm with BMW Motorrad Paralever, central strut, spring preload and rebound damping adjustable | BMW Paralever (single-sided swinging arm) Single gas-filled shock absorber with coil spring, Preload adjustment (continuously adjustable by handwheel), Rebound damping (continuously adjustable by screw) | Monolever swinging arm |
| Front Brakes: | 2x 320mm floating discs, 4-piston radial brake calipers | 2 x 305mm discs, 4 piston calipers | 2 x ∅320mm discs, 4 piston calipers | 2 x ∅297mm Discs, 3 piston calipers | Single ∅260mm disc |
| Rear Brakes: | Single 276mm disc, 2-piston floating caliper | Single 276mm disc, 2 piston caliper | Single ∅285mm disc, 2 piston caliper | Single ∅250mm disc, 3 piston caliper | ∅200mm Drum |
| Front Tyre: | 120/70 ZR17 | 120/70-ZR17 | 120/70 ZR17 | 110/80 R19 | 3.00 - 21 |
| Rear Tyre: | 180/55 ZR17 | 160/60-ZR18 | 170/60 ZR18 | 150/70 R17 | 4.00 - 18 |
| Seat Height: | 805 mm to 825 mm / 31.6 in to 32.4 in 760 mm to 850 mm / 29.9 in to 33.4 in - optional | 800 mm / 31.4 in. Optional adjustable: 780 mm / 30.7 in / 820 mm / 32.3 in | 770 mm to 800 mm / 303 in. to 31.5 in. | 840 mm / 33.0 in - 860 mm / 33.8 in | 860 mm / 33.9 in |
| Wet Weight: | 279 kg / 615 lbs | 282 kg / 622 lbs | 280 kg / 617 lbs | 240 kg / 549 lbs | 186 kg / 409 lbs |
| Fuel Capacity: | 25 Litres / 6.6 US gal | 23 Litres / US 6.1 gal | 22 L / 5.8 US gal | 24 Liters / US 6.3 gal | 19.5 L / 5.1 US gal |