1991 BMW R 100 RT

Specifications
- Category
- Sport touring
- Displacement
- 979.0 ccm (59.74 cubic inches)
- Displacement (cc)
- 979.00
- Engine details
- Two cylinder boxer, four-stroke
- Power
- 60.0 HP (43.8 kW) @ 6500 RPM
- Top speed
- 168.0 km/h (104.4 mph)
- Compression
- 8.4:1
- Bore × stroke
- 94.0 x 70.6 mm (3.7 x 2.8 inches)
- Valves/cyl
- 2.0
- Fuel control
- Overhead Valves (OHV)
- Cooling
- Air
- Gearbox
- 5-speed
- Transmission
- Shaft drive (cardan) (final drive)
- Front tyre
- 90/90-18
- Rear tyre
- 120/90-18
- Front brakes
- Dual disc
- Rear brakes
- Expanding brake
- Wet weight
- 238.0 kg (524.7 pounds)
- Fuel capacity
- 22.00 litres (5.81 US gallons)
The 1991 BMW R 100 RT
1991 BMW R 100 RT sits in the middle of BMW's touring range, built for riders who want distance-eating comfort without stepping up to a full dresser. This is the airhead boxer twin in its final, most refined form, wrapped in a substantial fairing designed to push wind and weather away from the rider rather than around them. Power delivery is unhurried and torque-driven, the kind of engine that rewards steady highway cruising over aggressive throttle work, and the shaft drive means no chain maintenance on long trips. It's a bike that feels heavy at a standstill but settles into a stable, planted character once moving, which is exactly the point on a machine meant for touring rather than back-road thrashing. The 1991 model carried over without significant mechanical changes from the prior year — buyers comparing it to a 1990 example should focus on mileage, service history, and condition rather than spec differences. Owners tend to be experienced riders, often coming from smaller BMWs or Japanese tourers, who want the airhead engine specifically before BMW moved to the oilhead generation. Collector interest sits at a moderate level, driven mostly by riders who want a usable classic rather than a garage ornament.
Auction history
| Date | Listing | Price | Mileage | Source |
|---|---|---|---|---|
| Oct 8, 2025 | 1991 BMW R100RT w/Watsonian Monaco Sidecar | $3,000 | — | Bring a Trailer |
| Oct 6, 2025 | Modified 1991 BMW R100RT | $8,100 | — | Bring a Trailer |
| Aug 15, 2025 | 1991 BMW R100RT | $3,520 | — | Bring a Trailer |
| Oct 2, 2024 | 1991 BMW R100RT | $3,600 | — | Bring a Trailer |
| Jun 9, 2024 | 1991 BMW R100RT | $2,100 | — | Bring a Trailer |
| Apr 19, 2022 | 1991 BMW R100RT | $6,300 | — | Bring a Trailer |