Ducati 900 SS (1977) vs Ducati 500GTL (1979-81)
Comparison technical specifications
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| Make: | Ducati | Ducati |
| Model: | 900 SS | 500GTL |
| Years: | 1977 | 1979-81 |
| Engine: | Four stroke, 90°“L”twin cylinder, SOHC, 2 valves per cylinder, bevel gear driven | Four stroke, parallel twin cylinder, SOHC, chain driven, 2 valve per cylinder |
| Capacity: | 864 cc / 52.7 cu in | 496.9 cc / 30.2 cu in |
| Bore x Stroke: | 86 x 74.4 mm | 78 x 52 mm |
| Compression Ratio: | 9.5:1 | 9.6:1 |
| Cooling System: | Air cooled | Air cooled |
| Induction: | 2 x Dell'Orto PHM 40 A, B or C carburetors | Dell'Orto PHF30BS/BD |
| Ignition: | Electronic | Points and coil |
| Battery: | Yuasa 12N/12A-4A-12V | Yuasa Y50-N18L-A1, 12V 18Ah |
| Starting: | Kick (electric as an option) | Kick |
| Max Power: | 49.2 kW / 67 hp @ 7500 rpm | 25.7 kW / 35 hp @ 6500 rpm |
| Clutch: | Wet, multiplate | Wet, multiplate |
| Transmission: | 5 Speed | 5 Speed |
| Primary Drive Ratio: | 2.187:1 (32/70) | 2.125:1 (32/68) |
| Gear Ratios: | 1st 2.237 / 2nd 1.562 / 3rd 1.203 / 4th 1.000 / 5th 0.887 | 1st 2.500 / 2nd 1.714 / 3rd 1.333 / 4th 1.074 / 5th 0.900:1 |
| Final Drive Ratio: | 2.312:1 (16/37) | 2.923:1 (13/38) |
| Final Drive: | Chain | Chain |
| Front Suspension: | 38 mm Marzocchi fork | 35 mm Paioli telescopic fork |
| Rear Suspension: | Marzocchi 310 mm dual shocks, 3-way adjustable | Swing arm, 2 x Marzocchi shocks, 3-way adjustable |
| Front Brakes: | 2 x 280mm Disc, 1 piston caliper | 2 x 256 mm Brembo discs |
| Rear Brakes: | Single 229 mm disc | Single 260 mm Brembo disc |
| Dimensions: | Length: 2200 mm / 86.6 in Width: 675 mm / 26.6 in Height: 1050 mm / 41.3 in | Length: 2050 mm / 80.7 in Width: 760 mm / 29.9 in Height: 1060 mm / 41.7 in |
| Wheelbase: | 1500 mm / 59.0 in | 1400 mm / 55.1 in |
| Seat Height: | 760 mm / 29.9 in | 760 mm / 29.9 in |
| Dry Weight: | 188 kg / 414 lbs | 183 kg / 403 lbs |
| Fuel Capacity: | 20 L / 5.3 US gal / 4.4 Imp gal | 19 L / 5.0 US gal / 4.2 Imp gal |
| Top Speed: | 217 km/h / 135 mph | 175 km/h / 109 mph |