BMW R 80GS (1989) vs Yamaha TDM 900A (2006-07) vs Yamaha RD 125 (1979-80) vs Yamaha SR 400 (2018)
Comparison technical specifications
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| Make: | BMW | Yamaha | Yamaha | Yamaha |
| Model: | R 80GS | TDM 900A | RD 125 | SR 400 |
| Years: | 1989 | 2006-07 | 1979-80 | 2018 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder | Four stroke, parallel twin cylinder, DOHC, 5 valves per cylinder | Two stroke, parallel twin | Four stroke, single cylinder, SOHC, 2 valves per cylinder. |
| Capacity: | 797.5 cc / 48.7 cu in. | 897 cc / 54.7 cu-in | 124 cc / 7.6 cu-in | 399 cc / 24.3 cu-in |
| Bore x Stroke: | 84.8 x 70.6 mm | 92 x 67.5 mm | 43 х 43 mm | 87 х 67.2 mm |
| Cooling System: | Air cooled | Liquid cooled | Air cooled | Air cooled |
| Compression Ratio: | 8.2:1 | 10.4:1 | 6.8:1 | 8.5:1 |
| Induction: | 2 x Bing constant depression carburetors | Electronic Fuel Injection | 2x 18mm Teikei carburetors | Fuel injection |
| Ignition: | Battery ignition | TCI | Battery coil | TCI |
| Starting: | Electric | Electric | Kick | Kick |
| Max Power: | 37 kW / 50 hp @ 6500 rpm | 86.2 hp / 63.4kW @ 7500 rpm | 17 hp / 12.4 kW @ 8500 rpm | 27 hp / 17.1 KW @ 7000 rpm |
| Max Torque: | 61 Nm / 6.2 kgf-m / 44 ft lb @ 5000 rpm | 88.8 Nm / 9.1 kgf-m @ 6000 rpm | 1.3 kgf-m @ 8000 rpm | 27.4 Nm / 6.3 kgf-m @ 6500 rpm |
| Transmission: | 5 Speed | 6 speed | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Chain | Chain | Chain |
| Frame: | Double loop tubular frame with bolt on rear section | Aluminium, diamond shaped | steel tube engine used as a stressed member | Steel Double Cradle |
| Front Suspension: | ∅40mm Marzocchi telescopic hydraulic forks. | Telescopic fork | 28 mm telescopic forks | Telescopic fork |
| Rear Suspension: | BMW Paralever swinging arm | Swingarm Link-type | Dual rear shock pre-load adjustable | Dual shocks |
| Front Brakes: | Single ∅285mm disc | 2 x 298mm discs with ABS | Single240mm disc | Single disc |
| Rear Brakes: | ∅200mm Drum | Single 248mm disc with ABS | 130 mm Drum | Drum |
| Front Tyre: | 90/90 x 21S | 120/70 ZR18 | 2.75-18 | 3.50-19 |
| Rear Tyre: | 13/80 x 17S | 160/60 ZR17 | 3.00-18 | 4.00-16 |
| Wheelbase: | 1514 mm / 59.6 in | 1485 mm / 58.5 in | 1245 mm / 49.0 in | 1410 mm / 55.5 in |
| Seat Height: | 850 mm / 33.5 in | 825 mm / 32.5 in | 749 mm / 29.5 in | 790 mm / 30.9 in |
| Wet Weight: | 210 kg / 462 lbs | 223.0 kg / 491.6 lbs | 115 kg / 255 lbs | 174 kg / 384 lbs |
| Fuel Capacity: | 24 L / 6.3 US gal | 20 Litres / 5.2 US gal | 11.5 Litres / 3.04 US gal | 12 Litres / 3.2 US gal |