VS
The 1973 BMW R90S and 1977 BMW R100RS represent two chapters in BMW's storied history.
The 1973 BMW R90S from Germany was powered by a 898cc OHV flat-twin producing 67hp at 7000rpm. Weighing 200.0kg (441 lbs) and with a seat height of 810mm, it was aimed at sportbike riders.
The 1977 BMW R100RS by contrast offered 980cc of OHV flat-twin power, delivering 70hp at 7250rpm. Tipping the scales at 210.0kg (463 lbs) with a top speed of 200km/h (124 mph), it offered a distinct riding experience. 1970s bikes from the Japanese superbike revolution are increasingly sought after. Clean, original examples have seen significant value appreciation.
The 1973 BMW R90S from Germany was powered by a 898cc OHV flat-twin producing 67hp at 7000rpm. Weighing 200.0kg (441 lbs) and with a seat height of 810mm, it was aimed at sportbike riders.
The 1977 BMW R100RS by contrast offered 980cc of OHV flat-twin power, delivering 70hp at 7250rpm. Tipping the scales at 210.0kg (463 lbs) with a top speed of 200km/h (124 mph), it offered a distinct riding experience. 1970s bikes from the Japanese superbike revolution are increasingly sought after. Clean, original examples have seen significant value appreciation.
Specifications Comparison
| 1973 BMW R90S | 1977 BMW R100RS | |
|---|---|---|
| Displacement | 898 cc | 980 cc |
| Power | 67 hp | 70 hp |
| Torque | 68.0 Nm | 72.0 Nm |
| Cylinders | 2 | 2 |
| Top Speed | 200 km/h | 200 km/h |
| Quarter Mile | — | — |
| Dry Weight | 200.0 kg | 210.0 kg |
| Wet Weight | 215.0 kg | 228.0 kg |
| Seat Height | 810 mm | 810 mm |
| Wheelbase | 1465 mm | 1465 mm |
| Fuel Capacity | 17.0 L | 24.0 L |
| Gears | 5 -speed | 5 -speed |
The Verdict
Comparing these two BMW machines reveals the brand's evolution. The 1973 BMW R90S laid the groundwork with 67hp, while the later 1977 BMW R100RS pushed output to 70hp. From a collector's perspective, the 1973 BMW R90S holds the edge with a 9/10 rating. Either way, both are worthy additions to any BMW collection.
About the 1973 BMW R90S
The 1973 1973 BMW R90S packs a 898cc OHV flat-twin engine with 67hp into a sport bike package from BMW.
Full 1973 BMW R90S Profile →About the 1977 BMW R100RS
A touring motorcycle from 1977, the 1977 BMW R100RS delivers 70hp from its 980cc OHV flat-twin engine.
Full 1977 BMW R100RS Profile →