BMW R 80RT Mono (1984-85) vs BMW G 450X (2008) vs BMW K100 LT (1987-88) vs BMW R 67/3 (1955-56) vs AJS Model 20 500 (1948-61)
Comparison technical specifications
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| Make: | BMW | BMW | BMW | BMW | AJS |
| Model: | R 80RT Mono | G 450X | K100 LT | R 67/3 | Model 20 500 |
| Years: | 1984-85 | 2008 | 1987-88 | 1955-56 | 1948-61 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Four stroke, single cylinder, DOHC, 4 valve | Four stroke, horizontal in line four cylinder, DOHC, 2 valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder. | Four stroke, parallel twin cylinder, OHV. 2 valve per cylinder, Crankshaft: 3-saved plain bearing / roller bearing |
| Capacity: | 797.5 cc / 48.7 cu in. | 449 cc / 27.4 cub. in. | 987 cc / 60.2 cub. in | 594 cc / 36.2 cu in | 498 cc / 30.4 cu in |
| Bore x Stroke: | 84.8 x 70.6 mm | 98 x 59 mm | 67 x 70 mm | 72 x 73 mm | 66 x 72.8 mm |
| Compression Ratio: | 8.2:1 | 12.0 :1 | 10.2:1 | 6.2:1 | 7.3:1 |
| Induction: | 2 x Bing constant depression carburetors | Electronic fuel injection | Electronic injection, Bosch LE-Jetronic | 2 x Bing 1/24/25 - 1/24/26 carburetors | Carburetor |
| Starting: | Electric | Electric | Electric | Kick | Kick |
| Max Power: | 36.4 kW / 50 hp @ 6500 rpm | 30.7 kW / 41 hp @ 7000 rpm | 65.6 kW / 90 hp @ 8000 rpm | 20.9 kW / 28 hp @ 5600 rpm | 21.6 kW / 29 hp |
| Clutch: | Dry single plate, with diaphragm spring | Multiple plate in oil bath | Dry, single plate, cable operated | Single plate, dry | Multi Plate (dry, Burman) |
| Transmission: | 5 Speed | 5 Speed | 5 Speed | 4 Speed | 4 Speed |
| Final Drive: | Shaft | Chain | Shaft | Shaft | Chain |
| Front Suspension: | Telescopic hydraulic forks. | 45mm Upside-down forks | Telescopic fork with hydraulic shock absorber | Telescopic front fork with hydraulic damping; plunger type | Hydraulic telescopic fork |
| Rear Suspension: | Long swinging arm with adjustable strut. | Direct Mounted Öhlins Shock | Monolever swinging arm | Spring with coil compression springs and rubber deflection stops | Dual chocks |
| Front Brakes: | 2 x ∅260mm discs, 1 piston caliper | Single 260mm disc, 2 piston floating caliper | 2 x ∅285 mm discs, 2 piston calipers | ∅200mm Drum duplex full hub | Drum |
| Rear Brakes: | Single ∅200mm drum | Single 220mm disc, 1 piston floating caliper | Single ∅285 mm disc, 1 piston caliper | ∅200mm Drum simplex full hub | Drum |
| Front Tyre: | 3.25 - H19 | 90/90-21 | 100/90-18 | 3.50 -19" | 3.25 -18 |
| Rear Tyre: | 4.00 - H18 | 140/80-18 | 130/90-17 | 3.50 -19" (sidecar, rear 4.00 x 18") | 3.25 -18 |
| Fuel Capacity: | 24 Litres / 6.3 gal | 8 Litres / 2.1 US gal | 22 Liters / 5.8 US gal | 17 liters / 4.4 US gal | 17 L / 4.5 US gal |