Aprilia RX 125 (1983-84) vs Harley-Davidson Harley Davidson XG 500 Street (2014-15) vs Harley-Davidson Harley Davidson XL 1200V Seventy Two (2014-15)
Comparison technical specifications
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| Make: | Aprilia | Harley-Davidson | Harley-Davidson |
| Model: | RX 125 | Harley Davidson XG 500 Street | Harley Davidson XL 1200V Seventy Two |
| Years: | 1983-84 | 2014-15 | 2014-15 |
| Engine: | Single cylinder, two stroke | Four stroke, Revolution X™ 60° V-Twin, SOHC, 4 valves per cyclinder. | Four stroke, 45° V-Twin, OHV, 2 valves per cylinder. |
| Capacity: | 124.8 cc / 7.6 cu in | 494 cc / 30 cu in | 1199 cc / 73.2 cub in. |
| Bore x Stroke: | 54 x 54.5 mm | 69 x 66 mm | 88.8 x 96.8 mm |
| Compression Ratio: | 11.5:1 | 11:01 | 9.7:1 |
| Cooling System: | Liquid cooled | Liquid cooled | Air cooled |
| Starting: | Electric and kick | Electric | Electric |
| Transmission: | 6 Speed | 6 Speed | 5 Speed |
| Final Drive: | Chain | Belt | Belt |
| Front Brakes: | Drum | Single disc, 2 piston floating caliper | Single 292 mm disc, 2 piston caliper |
| Rear Brakes: | Drum | Single disc, 2 piston floating caliper | Single 292 mm disc, 1 piston calipers |
| Front Tyre: | 3.00-21 | 100/80 R17 | D402F MH90-21 54H |
| Rear Tyre: | 4.00-18 | 140/75 R15 | D401 150/80B16 71H |
| Dry Weight: | 91 kg / 201 lbs | 206 kg / 455 lbs | 248 kg / 546 lbs |
| Fuel Capacity: | 8.5 L / 2.2 US gal | 13.1 Litres / 3.5 US gal | 13.7 Litres / 2.1 us gal |