BMW R 100CS (1981-82) vs Aprilia RX 125 R (2007-09)
Comparison technical specifications
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| Make: | BMW | Aprilia |
| Model: | R 100CS | RX 125 R |
| Years: | 1981-82 | 2007-09 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder | Single cylinder two stroke. Aluminium cylinder with Nikasil coated liner. Read valve intake. Separate mixing. Homologated to Euro 3 standard. |
| Capacity: | 980 cc / 59.8 cu in. | 124.8 cc / 7.6 cu in |
| Bore x Stroke: | 94 x 70.6 mm | 54 x 54.5 mm |
| Cooling System: | Air cooled | Liquid cooled |
| Compression Ratio: | 9.5:1 | 12.5:1 |
| Induction: | 2x Constant depression carburetors, Bing 94/40/111 - 94/40/112 | Dell’Orto VHST 28 |
| Ignition: | Battery ignition | Electronic CDI |
| Starting: | Electric | Electric and kick |
| Transmission: | 5 Speed | 6 Speed |
| Gear Ratio: | 1st 4.40 / 2nd 2.86 / 3rd 2.07 / 4th 1.67 / 5th 1.50:1 | 1st 10:30 / 2nd 14:29 / 3rd 17:27 / 4th 19:25 / 5th 21:23 / 6th 22:21 |
| Final Drive: | Shaft | Chain |
| Frame: | Double sown tubs, dual cradle | High strength steel frame with double trellis beam and double cradle. Separate seat frame. |
| Front Suspension: | Telescopic fork with hydraulic shock absorber. | Upside down telescopic fork, Ø 40 mm. |
| Front Wheel Travel: | 200 mm / 7.8 in | 260 mm / 10.2 in |
| Rear Suspension: | Long swinging arm with adjustable strut. | Steel swingarm. Hydraulic monoshock with piggy back cylinder. |
| Rear Wheel Travel: | 125 mm / 4.9 in | 270 mm / 10.6 in |
| Front Brakes: | Single ∅260mm disc | Single Ø 260 mm disc. 2 piston caliper |
| Rear Brakes: | 200 Drum | Single Ø 220 mm disc, 1 piston caliper |
| Front Tyre: | 3.25 - H19 | 90/90-21 |
| Rear Tyre: | 4.00 - H18 | 120/90 18 |
| Fuel Capacity: | 24 L / 6.3 US gal | 10 liters / 2.6 US gal |
| Consumption Average: | 4.8 L/100 km / 20.8 km/l / 49 US mpg | 5.4 L/100 km / 18.4 km/l / 43 US mpg |
| Standing ¼ Mile: | 12.9 sec / 168.7 kmh / 104.8 mph | 20.3 sec |
| Top Speed: | 198 km/h / 123 mph | 185 km/h / 115 mph |