BMW R 100RS (1977) vs BMW F 650GS Dakar (2007) vs Beta RS 520 (2012) vs Beta Alp 125 4T (2008) vs BMW R 100RT Classic (1995)
Comparison technical specifications
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| Make: | BMW | BMW | Beta | Beta | BMW |
| Model: | R 100RS | F 650GS Dakar | RS 520 | Alp 125 4T | R 100RT Classic |
| Years: | 1977 | 2007 | 2012 | 2008 | 1995 |
| Engine: | Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder | Four stroke, single cylinder, DOHC, 4 valves per cylinder | Four stroke, single cylinder,4 valve | Four stroke, single cylinder, SOHC, 2 valves per cylinder | Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder |
| Capacity: | 980 cc / 59.8 cub in. | 652 cc / 39.8 cub. in. | 497.4 cc / 30.4 cu in | 124 cc / 7.6 cu in | 980 cc 59.8 cu in |
| Bore x Stroke: | 94 x 70.6 mm | 100 x 83mm | 100 x 63.4 mm | 54 x 54 mm | 94 x 70.6 mm |
| Compression Ratio: | 9.5:1 | 11.5:1 | 12.1:1 | 10.0:1 | 8.45:1 |
| Induction: | 2 x Constant depression carburettors, Bing 94/40/105 - 94/40/106 | Fuel induction | Keihin FCR-MX Ø 39mm | Mikuni UCAL, 26 mm Ø | 2 x Constant depression carburettors, Bing 94/40/105 - 94/40/106 |
| Ignition: | Battery ignition | Capacitor Discharge Ignition system | DC-CDI with variable ignition timing, Kokusan. | Electronic | Battery ignition |
| Starting: | Electric | Electric | Electric and kick | Electric & kick | Electric |
| Transmission: | 5 Speed | 5 Speed | 6 Speed | 5 Speed | 5 Speed |
| Final Drive: | Shaft | Chain | O-ring chain, DID | Chain | Shaft |
| Front Suspension: | Telescopic fork with hydraulic shock absorber. | 41mm Telescopic fork with stabilizer bridge | Sachs USD fork, Ø 48 mm, adjustable compression and rebound, TFX technology, | Hydraulic forks, 38 mm Ø | Telescopic fork with hydraulic shock absorber. |
| Front Wheel Travel: | 200 mm / 7.8 in | 210 mm / 8.3 in. | 290 mm / 11.4 in | 170 mm / 6.7 in | 200 mm / 7.8 in |
| Rear Suspension: | Long swinging arm with adjustable strut. | Spring setting and rebound stage damping continuously adjustable | Sachs shock w/adjustable rebound and hi/low speed compression, | Single shock adjustable spring preload | Monolever swinging arm |
| Rear Wheel Travel: | 125 mm / 4.9 in | 210 mm / 8.3 in. | 290 mm / 11.4 in | 180 mm / 7.1 in | 125 mm / 4.9 in |
| Front Brakes: | 2 x ∅260mm discs, 2 piston calipers | Single ∅300mm disc, 2 piston caliper | Single Ø 260 mm floating disc, 2 piston caliper, Nissen | Single 245 mm Ø disc, 2-piston caliper | 2 x ∅260mm discs, 2 piston calipers |
| Rear Brakes: | Simplex ∅200 mm drum | Single ∅240mm disc, 1 piston caliper | Single Ø 240 mm disc, 1 piston caliper, Nissen | Single 220 mm Ø disc, 1-piston caliper | Simplex ∅200 mm drum |
| Front Tyre: | 3.25 - H19 | 90/90 S21 | 90/90 - 21 | 90/90-21 | 3.25 H-19 |
| Rear Tyre: | 4.00 - H18 | 130/80-17 | 140/80 -1 8 | 120/80-18 | 4.00 H-18 |
| Seat Height: | 820 mm / 32.3 in | 870 mm / 34.3 in | 934.7 mm / 36.8 in | 850 mm / 33.5 in | 820 mm / 32.3 in |
| Fuel Capacity: | 24 Litres / 6.3 US gal | 17.3 Litres / 4.6 US gal. | 7.9 L / 2.1 US gal | 6.8 L / 1.8 US gal | 24 Litres / 6.3 US gal |