Derbi GPR 125 (2011-) vs ATK 500 (2003) vs Buell / EBR Buell XR9S Lightning (2003) vs Sunbeam Model 8 (1924-31)
Comparison technical specifications
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| Make: | Derbi | ATK | Buell / EBR | Sunbeam |
| Model: | GPR 125 | 500 | Buell XR9S Lightning | Model 8 |
| Years: | 2011- | 2003 | 2003 | 1924-31 |
| Engine: | Two stroke, single cylinder | Four stroke. single cylinder, DOHC, 4 valves | 45° V-Twin, four stroke, pushrod actuated overhead valve. hydraulic self-adjusting lifters, 2 valve per cylinder | Single cylinder, OHV |
| Capacity: | 124.7 cc / 7.6 cu-in | 494 cc / 30.1 cu in | 984 cc / 60 cu in | 347 cc / 21.2 cu in |
| Bore x Stroke: | 56 x 50 mm | 97 x 81 mm | 88.9 x 79.4 mm | 70 x 90 mm |
| Cooling System: | Liquid cooled | Air cooled | Air cooled | Air cooled |
| Induction: | 28mm Mikuni | 40 mm Dell'Orto carb | 45 mm Downdraft DDFI fuel injection | AMAC carburettor |
| Starting: | Electric | Kick | Electric | Kick |
| Transmission: | 6 Speed | 6-Speed | 5 Speed, constant mesh | 3-Speed |
| Final Drive: | Chain | Chain | Kevlar belt | Chain |
| Front Suspension: | 40mm Fourche USD hydraulic forks, 120mm wheel travel | Telescopic fork | Showa upside-down forks, adjustable for preload, compression & rebound damping | Druid forks |
| Rear Suspension: | Monoshock, 110mm wheel travel | Swingarm, monoshock | Showa shock absorber, adjustable for preload, compression & rebound damping | Rigid, spring loaded saddle |
| Front Brakes: | Single 300mm disc 4 piston caliper | Single 260 mm disc, 2-piston caliper | ZTL-type brake, 6-piston fixed caliper, Ø375 mm single sided, inside out, stainless steel, floating rotor | Drum, internal expanding |
| Rear Brakes: | Single 180mm disc 2 piston caliper | Single 220 mm disc, 1-piston caliper | Single 230 mm disc, 1 piston caliper | Drum, internal expanding |