Aprilia RX 125 R (2007-09) vs Suzuki GSX 550EF (1984-86) vs Ducati 450 Mark 3 (1969-75) vs BMW R 850 RT (2000-02)
Comparison technical specifications
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| Make: | Aprilia | Suzuki | Ducati | BMW |
| Model: | RX 125 R | GSX 550EF | 450 Mark 3 | R 850 RT |
| Years: | 2007-09 | 1984-86 | 1969-75 | 2000-02 |
| Engine: | 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 valves per cylinder. | Four stroke, single cylinder, SOHC, bevel gear driven | Four stroke, two-cylinder, horizontally-opposed Boxer engine, 4 valves per cylinder |
| Capacity: | 124.8 cc / 7.6 cu in | 572 cc / 34.9 cu in | 435.7 cc / 26.6 cu in | 848 cc / 51.7 cu in. |
| Bore x Stroke: | 54 x 54.5 mm | 60 x 50.6 mm | 86 x 75 mm | 87.5 x 70.5 mm |
| Compression Ratio: | 12.5:1 | 9.8:1 | 9.3:1 | 10.3:1 |
| Cooling System: | Liquid cooled | Air/oil cooled | Air cooled | Air/Oil-cooled |
| Induction: | Dell’Orto VHST 28 | 2 x 32 mm Mikuni carburetors | Dell'Orto VHB 29 AD | Electronic injection, Bosch Motronic |
| Ignition: | Electronic CDI | Transistorized | Points and coil (electronic from 1973) | Electronic Bosch Motronic MA 2.4 |
| Starting: | Electric and kick | Electric | Kick | Electric |
| Transmission: | 6 Speed | 6 Speed constant mesh | 5 Speed | 5 Speed |
| Final Drive: | Chain | #50 (530) Chain, 112 links, O-ring sealed | Chain | Shaft |
| Front Suspension: | Upside down telescopic fork, Ø 40 mm. | Posi Damp Fork System, telescopic forks, coil spring, oil dampened | 35 mm Marzocchi telescopic fork | Motorrad Telelever, stanchion ∅35 mm, central strut, rebound damping adjustable. |
| Rear Suspension: | Steel swingarm. Hydraulic monoshock with piggy back cylinder. | Full floating suspension system, spring preload, fully adjustable | Swingarm, dual Marzocchi shocks, 3-way adjustable | Die-cast aluminium single sided swinging arm with BMW Motorrad Paralever, central strut, spring preload adjustable to continuously variable levels by means of a hydraulic handwheel, rebound adjustable damping. |
| Front Brakes: | Single Ø 260 mm disc. 2 piston caliper | 2 x 260 mm discs, 2 piston caliper | Drum, 180 mm | 2 x ∅320mm discs, 4 piston calipers |
| Rear Brakes: | Single Ø 220 mm disc, 1 piston caliper | Single 250 mm disc, 2 piston caliper | Drum, 160 mm | Single ∅276mm disc, 2 piston caliper |
| Front Tyre: | 90/90-21 | 100/90-16 54H | 2.75-18 | 120/70 - ZR17 |
| Rear Tyre: | 120/90 18 | 110/90-18 61H | 3.00-18 | 160/60 - ZR17 |
| Fuel Capacity: | 10 liters / 2.6 US gal | 18 Litres / 4.8 US gal / 4.0 Imp gal | 13 Litres / 3.4 US gal / 2.9 Imp gal | 20.5 Liters / 5.4 US gal |