BMW R 45
Number sold 28.158
Price 5.880,- DM
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| Type | four-stroke, two-cylinder, horizontally-opposed "Boxer" engine, air-cooled |
| Bore/stroke | 70 x 61,5 mm |
| Cubic capacity | 473,4 cm3 |
| Max power | 35 PS (26kW) at 7250 rpm [27 PS (20kW) at 6500 rpm] |
| Max torque | 37,5 Nm at 5500 rpm [31,3 Nm at 5000 rpm] |
| Compression ratio | 9,2 : 1 [ 8,2 : 1] |
| Valves per cylinder | 2 |
| Valve control | ohv, using push rod and rocker arm |
| Carburation system | 2 constant depression carburettors Bing 64/28/303-304 [Bing 64/26/303-304] |
| Engine lubrication | wet sump |
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| Power transmission | |
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| Clutch | dry single plate, with diaphragm spring |
| Number of gears | 5 |
| Gear selection | dog-type gearbox (ratchet foot lever) |
| Gear ratios | 4,4 / 2,86 / 2,07 / 1,67 / 1,50 :1 |
| Rear wheel ratio | 1 : 3,89 [1 : 4,25] |
| Bevel/crown wheel | 9 / 35 teeth [8 / 34 teeth] |
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| Electrical system | |
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| Alternator | Bosch 280 W |
| Ignition | battery ignition |
| Starter | Bosch 0,7 kW |
| Spark plugs | Bosch W 5 D / Beru 14-5D / Champion N 6 Y [Bosch W 7 D / Beru 14 - 7 D / Champion N 10 Y] |
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| Suspension | |
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| Type of frame | double-loop tubular frame with bolt-on rear section |
| Front suspension | telescopic fork with hydraulic shock absorber |
| Rear suspension | long swinging arm with adjustable strut |
| Spring travel | 175 / 110 mm |
| Rims front | 1,85 B 18 |
| Rims rear | 2,50 B 18 |
| Tyres front | 3,25 S 18 |
| Tyres rear | 4,00 -S 18 |
| Brakes front | single disc brake Ø 260 mm |
| Brakes rear | Simplex drum brake Ø 200 mm |
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| Dimensions and weights | |
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| Length x width x height | 2210 x 688 x 1080 mm |
| Wheel base | 1400 mm |
| Ground clearance | 130 mm |
| Tank capacity | 22 l |
| Unladen weight, full tank | 205 kg |
| Max permissible weight | 398 kg |
| Fuel consumption | 5,5 l / 100 km [5,0 l / 100 km] ( at konstant 90 km/h) |
| Acceleration | 0 - 100 km/h 7,4 s [8,5 s] |
| Top speed | 160 km/h [145 km/h] |
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