Aprilia ETX 125 (1984-85) vs BMW F 850GS Adventure 40 Years Edition (2021)
Comparison technical specifications
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| Make: | Aprilia | BMW |
| Model: | ETX 125 | F 850GS Adventure 40 Years Edition |
| Years: | 1984-85 | 2021 |
| Engine: | Two stroke single cylinder | Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder |
| Capacity: | 123.6 cc / 7.54 cu in | 853 cc / 52 cu-in |
| Bore x Stroke: | 54 x 54 mm | 84 x 77mm |
| Compression Ratio: | 15.5:1 | 12.7:1 |
| Transmission: | 6 Speed | Constant mesh 6-speed gearbox integrated in crankcase |
| Final Drive: | Chain | Endless O-ring chain with shock damping in rear wheel hub |
| Frame: | Single steel beam cradle | Steel bridge frame in monocoque design, load-bearing engine |
| Front Suspension: | Hydraulic telescopic front fork, Marzocchi Ø35 mm | 43 mm USD forks |
| Rear Suspension: | Swingarm with single shock absorber | Cast aluminium dual swing arm, central WAD spring strut, spring pre-load hydraulically adjustable, rebound damping adjustable |
| Front Brakes: | Single disc, Ø230 mm | 2 x 305mm floating discs, 2 piston floating calipers |
| Rear Brakes: | Drum, Ø125 mm | Single 265mm disc,1 piston floating caliper |
| Front Tyre: | 2.75-21 | 90/90 21 |
| Rear Tyre: | 4.00-18 | 150/70 R17 |
| Fuel Capacity: | 10 Litres / 2.6 US gal | 23 Litres / 6 US gal |