Yamaha RD / RZ 125LC (1981-82) vs BMW G 650 X Challenge (2008) vs BMW HP 4 Racer (2018) vs Arlen Ness Victory Vision (2010-11)
Comparison technical specifications
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| Make: | Yamaha | BMW | BMW | Arlen Ness |
| Model: | RD / RZ 125LC | G 650 X Challenge | HP 4 Racer | Victory Vision |
| Years: | 1981-82 | 2008 | 2018 | 2010-11 |
| Engine: | Two stroke, single cylinder | Four stroke, single cylinder, DOHC, 4 valves per cylinder | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder | Four stroke, 50° V twin SOHC, 4 valves per cylinder, self-adjusting cam chains, hydraulic lifters |
| Capacity: | 123 cc / 7.5 cu-in | 652 cc / 39.8 cub in. | 999 cc / 61 cu in. | 1731 cc / 105.6 cu-in |
| Bore x Stroke: | 56 х 50 mm | 100 x 83 mm | 80 x 49,7 mm | 101 x 108 mm |
| Compression Ratio: | 6.4:1 | 11.5:1 | 13.7-13.9 : 1 | 9.8:1 |
| Induction: | 24mm Mikuni carburetors | Fuel induction | Mixture control engine management Electronic racing injection, variable intake pipe length, four selectable modes | Electronic Fuel Injection with 45mm throttle bodies |
| Starting: | Kick | Electric | Electric | Electric |
| Transmission: | 6 Speed | 5 Speed | Constant-mesh 6 speed racing transmission (EVO) with straight-cut gears | 6 Speed |
| Final Drive: | Chain | Chain | Chain, Drive 16/43 (adjustable as part of equipment pack: sprocket 15, 16, 17, chainwheel 41, 42, 43, 44, 45) | Carbon Fiber Reinforced Belt |
| Front Suspension: | 32mm Telescopic forks | ∅45mm Upside-down telescopic fork | Öhlins FGR 300 WSBK fork, adjustable rebound and compression-stage damping, adjustable spring preload, Öhlins SD052 adjustable steering damper, front wheel quick-change system thanks to rotatable forklegs with front-wheel cover mounted (brake calipers need not be removed to change a wheel) spring stiffness 10.5 N/mm | 43mm Inverted cartridge telescopic fork, 130mm wheel travel |
| Rear Suspension: | Monocross linkage 6-way preload adjustment | Aluminum 2-unit cast swing arm, air damping | Aluminium WSBK swinging arm, Öhlins TTX 36 GP central spring strut, adjustable rebound and compression-stage damping, adjustable spring preload, top spring strut pivot point adjustable (0/3 mm), adjustable spring strut deflection (tension strut length), contact surfaces for wheel spacer bush on chain tensioners for simple/hands free wheel fitting, chain tensioner titanium on outside, aluminium on inside, CFRP auxiliary stand mountings on swinging arm, spring stiffness 95N/mm | Single, mono-tube gas forged and cast aluminum w/ rising-rate linkage 120mm wheel travel, preload adjustable spring |
| Front Brakes: | Single 245mm disc | Single ∅300mm disc, 2 piston calipers | 2 x Brembo Racing disc brake, T-floating racing brake discs, 320×6.75 mm diameter, 4-piston monobloc WSBK GP4-PR fixed caliper with titanium pistons, Brembo Racing RCS19X18 master cylinder, including adjustable Brembo Racing brake lever, Brembo Racing clutch lever (without clutch switch) | 2x 300mm floating rotor 3 piston caliper |
| Rear Brakes: | 130mm Drum | Single ∅240mm disc, 1 piston calipers | Single Brembo Racing disc brake, 4-piston WSBK fixed caliper with titanium pistons, brake disc diameter 220×4.0 mm Dimensions / weights | Single 300mm floating rotor 2 piston caliper |
| Front Tyre: | 2.75-18-4PR | 90/90 S 21 | 120/70 ZR 17 Pirelli Diabolo Superbike Slick SC2 | 130/70 R18 |
| Rear Tyre: | 3.00-18-6PR | 120/70 S 18 | 200/60 ZR 17 Pirelli Diabolo Superbike Slick SC2 | 180/60R16 |
| Seat Height: | 775 mm / 30.5 in | 930 mm / 36.6 in (low seat: 910 mm / 35.8 in.) | 831 mm / 32.7 in - (rider seat low / high, 816 mm / 32.1 in / 846 mm / 33.3 in) | 673 mm / 24.5 in |
| Dry Weight: | 98 kg / 216 lbs | 144 kg / 317 lbs. | 146 kg / 322 lbs | 364 kg / 800 lbs |
| Fuel Capacity: | 13 Litres / 3.4 US gal | 9.5 Litres / 2.5 US gal | 17.5 Litres / US 4.6 gal. | 22.7 Litres / 6.0 US gal |