BMW R 80RT Mono (1984-85) vs BMW G 450X (2008) vs BMW K100 LT (1987-88) vs BMW R 67/3 (1955-56) vs AJS Model 20 500 (1948-61) vs BMW HP 4 Racer (2018) vs BMW R 100/7 (1978-10)

Comparison technical specifications

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Make:	BMW	BMW	BMW	BMW	AJS	BMW	BMW
Model:	R 80RT Mono	G 450X	K100 LT	R 67/3	Model 20 500	HP 4 Racer	R 100/7
Years:	1984-85	2008	1987-88	1955-56	1948-61	2018	1978-10
Engine:	Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.	Four stroke, single cylinder, DOHC, 4 valve	Four stroke, horizontal in line four cylinder, DOHC, 2 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.	Four stroke, parallel twin cylinder, OHV. 2 valve per cylinder, Crankshaft: 3-saved plain bearing / roller bearing	Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder
Capacity:	797.5 cc / 48.7 cu in.	449 cc / 27.4 cub. in.	987 cc / 60.2 cub. in	594 cc / 36.2 cu in	498 cc / 30.4 cu in	999 cc / 61 cu in.	980 cc / 59.8 cu in.
Bore x Stroke:	84.8 x 70.6 mm	98 x 59 mm	67 x 70 mm	72 x 73 mm	66 x 72.8 mm	80 x 49,7 mm	94 x 70.6 mm
Compression Ratio:	8.2:1	12.0 :1	10.2:1	6.2:1	7.3:1	13.7-13.9 : 1	9.1:1
Induction:	2 x Bing constant depression carburetors	Electronic fuel injection	Electronic injection, Bosch LE-Jetronic	2 x Bing 1/24/25 - 1/24/26 carburetors	Carburetor	Mixture control engine management Electronic racing injection, variable intake pipe length, four selectable modes	2 x 36mm Bing V94 carburetors
Starting:	Electric	Electric	Electric	Kick	Kick	Electric	Electric
Max Power:	36.4 kW / 50 hp @ 6500 rpm	30.7 kW / 41 hp @ 7000 rpm	65.6 kW / 90 hp @ 8000 rpm	20.9 kW / 28 hp @ 5600 rpm	21.6 kW / 29 hp	158 kW / 215 hp @ 13900 rpm (maximum speed 14,500 rpm)	44.1 KW / 60 hp @ 7000 rpm
Clutch:	Dry single plate, with diaphragm spring	Multiple plate in oil bath	Dry, single plate, cable operated	Single plate, dry	Multi Plate (dry, Burman)	Multi-disc clutch in oil bath, anti-hopping clutch, mechanically operated	Single dry plate
Transmission:	5 Speed	5 Speed	5 Speed	4 Speed	4 Speed	Constant-mesh 6 speed racing transmission (EVO) with straight-cut gears	5 Speed
Final Drive:	Shaft	Chain	Shaft	Shaft	Chain	Chain, Drive 16/43 (adjustable as part of equipment pack: sprocket 15, 16, 17, chainwheel 41, 42, 43, 44, 45)	Shaft
Front Suspension:	Telescopic hydraulic forks.	45mm Upside-down forks	Telescopic fork with hydraulic shock absorber	Telescopic front fork with hydraulic damping; plunger type	Hydraulic 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	Telescopic fork with hydraulic shock absorber.
Rear Suspension:	Long swinging arm with adjustable strut.	Direct Mounted Öhlins Shock	Monolever swinging arm	Spring with coil compression springs and rubber deflection stops	Dual chocks	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	Long swinging arm with adjustable strut.
Front Brakes:	2 x ∅260mm discs, 1 piston caliper	Single 260mm disc, 2 piston floating caliper	2 x ∅285 mm discs, 2 piston calipers	∅200mm Drum duplex full hub	Drum	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)	Single ∅260mm disc
Rear Brakes:	Single ∅200mm drum	Single 220mm disc, 1 piston floating caliper	Single ∅285 mm disc, 1 piston caliper	∅200mm Drum simplex full hub	Drum	Single Brembo Racing disc brake, 4-piston WSBK fixed caliper with titanium pistons, brake disc diameter 220×4.0 mm Dimensions / weights	∅200mm Drum
Front Tyre:	3.25 - H19	90/90-21	100/90-18	3.50 -19"	3.25 -18	120/70 ZR 17 Pirelli Diabolo Superbike Slick SC2	3.25 - H19
Rear Tyre:	4.00 - H18	140/80-18	130/90-17	3.50 -19" (sidecar, rear 4.00 x 18")	3.25 -18	200/60 ZR 17 Pirelli Diabolo Superbike Slick SC2	4.00 - H18
Fuel Capacity:	24 Litres / 6.3 gal	8 Litres / 2.1 US gal	22 Liters / 5.8 US gal	17 liters / 4.4 US gal	17 L / 4.5 US gal	17.5 Litres / US 4.6 gal.	24 L / 6.3 US gal