BMW R 80 RT
The BMW R 80 RT was a motorcycle model of the manufacturer BMW with a two-cylinder four-stroke - boxer engine with 800 cc displacement and shaft drive to the rear wheel. It was built from 1982 to 1995, a total of 29,384 pieces. As a touring motorcycle (R T for touring) it was equipped with a sweeping full fairing with a high windshield. The engine with 797 cm³ displacement and 37 kW (50 hp) output came from the BMW R 80/7 .
Model 1982 to 1984
The model years 1982 to 1984 were essentially a slimmed-down version of the "bigger sister" R 100 RT. In principle, the smaller motor was simply built into the frame of the R 100 RT. Some of these models did not even have their own operating instructions (called "logbook" in BMW jargon), instead the logbook of the almost identical R 100 models was used. The differences to the R 100 RT included the following:
- Monochrome paintwork (without the typical black edges)
- Cylinder head cover not painted
- Cylinder protection bar only as a special accessory
- Clock and voltmeter only as optional accessories
- Case holder only as an optional accessory.
- Drum brake instead of disc brake on the rear wheel
7,315 of this model were built.
Model Monolever 1984 to 1995
The models from model year 1984 (sometimes referred to as R 80 RT / 2) had a single- sided swing arm called a monolever and an 18 inch front wheel instead of the rear swing arm . In addition, the design has been significantly revised, especially the filigree cast aluminum wheels, but also the rear with seat, rear apron and side cover.
22,069 of this model were built.
Technical specifications
| R 80 RT | R 80 RT Monolever | |
|---|---|---|
| construction time | 1982-1984 | 1984-1995 |
| engine | ||
| Motor type | Four-stroke , two - cylinder boxer engine , air-cooled | |
| Bore × stroke | 84.8 x 70.6 mm | |
| Displacement | 797.5 cc | |
| power | 50 hp (37 kW ) at 6500 min -1 | |
| Max. Torque | 59 Nm at 3500 min -1 | 58 Nm at 4000 min -1 |
| Compression ratio | 8.2: 1 | |
| Valves | 2 each, hanging, valve control via tappets, push rods and rocker arms | |
| Mixture preparation | 2 constant pressure carburettors Bing V 64/32/305 - 64/32/306 | 2 constant pressure carburettors Bing V 64/32/353 - 64/32/354 |
| Engine lubrication | Wet swamp | |
| Power transmission | ||
| coupling | Single disc, dry, with geared disc spring | |
| circuit | Claw gear (ratchet foot gear) with 5 gears | |
| Gear ratio | 4.4 / 2.86 / 2.07 / 1.67 / 1.50: 1 | |
| Gear ratio | 2.07 | |
| Rear wheel ratio | 1: 3.36 | |
| Cardan transmission | Bevel / ring gear 11/37 teeth | |
| Electrical system | ||
| ignition | Contactless electronic ignition ( Bosch ) | |
| alternator | Bosch 280 W | |
| Starter | Bosch 700 W | |
| spark plug | Bosch W 7 D / Beru 14 - 7 D / Champion N 10 Y | Bosch W 7 DC / Beru 14 - 7 DU / Champion N 9 YC |
| landing gear | ||
| frame | Double loop tubular steel frame, screwed-on rear section | |
| Front suspension | Telescopic fork with hydraulic shock absorbers | |
| Rear suspension | Double swing arm with 2 spring legs | BMW Monolever ( single swing arm ) |
| Front / rear suspension travel | 200/125 mm | 175/121 mm |
| Front rim | Aluminum filigree cast 2.15 W x 19 | Aluminum filigree cast MTH 2.5 × 18 E |
| Rear rim | Aluminum filigree cast 2.50 W x 18 | Aluminum filigree cast MTH 2.5 × 18 E |
| Front tires | 3.25 S 19 | 90/90 18 51 H. |
| Rear tires | 4.00 S 18 | 120/90 18 65 H. |
| Brakes in front | Double disc brake Ø 260 mm | Single disc brake Ø 285 mm |
| Rear brakes | Simplex drum brake (Ø 200 mm) | |
| mass and weight | ||
| Length × width × height | 2210 mm × 746 mm × 1495 mm | 2175 mm × 960 mm × 1478 mm |
| wheelbase | 1465 mm | 1447 mm |
| Ground clearance | 130 mm | 140 mm |
| Tank capacity | 24.0 l , of which 2 liters reserve | 22.0 l, of which 2 liters reserve |
| Empty weight (full tank) | 230 kg | 227 kg |
| maximum weight allowed | 440 kg | |
| Fuel consumption | 5.5 l / 100 km (at a constant 90 km / h ) | 4.8 l / 100 km (at a constant 90 km / h) |
| Acceleration 0 - 100 km / h | 7.1 s | 6.4 s |
| Top speed | 161 km / h | 170 km / h |
