BMW R 100CS (1981-82) vs Aprilia RX 125 R (2007-09) vs Kawasaki Z 800e (2013)
Comparison technical specifications
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| Make: | BMW | Aprilia | Kawasaki |
| Model: | R 100CS | RX 125 R | Z 800e |
| Years: | 1981-82 | 2007-09 | 2013 |
| 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. | Four stroke, transverse four cylinder, DOHC, 4 valve per cylinder |
| Capacity: | 980 cc / 59.8 cu in. | 124.8 cc / 7.6 cu in | 806 cc / 49.1 cu-in |
| Bore x Stroke: | 94 x 70.6 mm | 54 x 54.5 mm | 71 x 50.9 mm |
| Cooling System: | Air cooled | Liquid cooled | Liquid cooled |
| Compression Ratio: | 9.5:1 | 12.5:1 | 11.9:1 |
| Induction: | 2x Constant depression carburetors, Bing 94/40/111 - 94/40/112 | Dell’Orto VHST 28 | Fuel injection: 34 mm x 4 (Mikuni), with dual throttle valves |
| Ignition: | Battery ignition | Electronic CDI | Digital |
| Starting: | Electric | Electric and kick | Electric |
| Transmission: | 5 Speed | 6 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 | 1st 2.571 (36/14) 2nd 1.941 (33/17) 3rd 1.556 (28/18) 4th 1.333 (28/21) 5th 1.200 (24/20) 6th 1.095 (23/21) |
| Final Drive: | Shaft | Chain | Chain |
| Frame: | Double sown tubs, dual cradle | High strength steel frame with double trellis beam and double cradle. Separate seat frame. | Tubular backbone (with engine sub-frame), high-tensile steel |
| Front Suspension: | Telescopic fork with hydraulic shock absorber. | Upside down telescopic fork, Ø 40 mm. | 41 mm inverted fork with rebound damping and spring preload adjustability, |
| Rear Suspension: | Long swinging arm with adjustable strut. | Steel swingarm. Hydraulic monoshock with piggy back cylinder. | Bottom-Link Uni-Trak, gas-charged shock with piggyback reservoir and stepless rebound damping and preload adjustability, |
| Rear Wheel Travel: | 125 mm / 4.9 in | 270 mm / 10.6 in | 137 mm / 5.3 in |
| Front Brakes: | Single ∅260mm disc | Single Ø 260 mm disc. 2 piston caliper | 2x semi-floating 310 mm discs 4 piston calipers |
| Rear Brakes: | 200 Drum | Single Ø 220 mm disc, 1 piston caliper | Single 220mm disc 1 piston caliper |
| Front Tyre: | 3.25 - H19 | 90/90-21 | 120/70 ZR17 |
| Rear Tyre: | 4.00 - H18 | 120/90 18 | 180/55ZR17 |
| Fuel Capacity: | 24 L / 6.3 US gal | 10 liters / 2.6 US gal | 17 Litres / 4.5 US gal |