BMW R 100RT (1980-81) vs BMW K1 (1988) vs BMW R 100 (1980-81) vs BMW R850C / R 850 C Avantgarde (1997-) vs BMW R 100GS Bubble Bee (1988) vs BMW R 80GS (1988)

Comparison technical specifications

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Make:	BMW	BMW	BMW	BMW	BMW	BMW
Model:	R 100RT	K1	R 100	R850C / R 850 C Avantgarde	R 100GS Bubble Bee	R 80GS
Years:	1980-81	1988	1980-81	1997-	1988	1988
Engine:	Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder	Four-stroke, horizontal in line four cylinder, DOHC, 4 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder	Four stroke, two-cylinder, horizontally-opposed Boxer engine, 4 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder
Capacity:	980 cc / 59.8 cub in.	987 cc / 60.2 cu in	980 cc / 59.8 cu in.	848 cc / 51.7 cu in.	980 cc / 59.8 cu in.	797.5 cc / 48.7 cu in.
Bore x Stroke:	94 x 70.6 mm	67 x 70 mm	94 x 70.6 mm	87.5 x 70.5 mm	94 x 70.6 mm	84.8 x 70.6 mm
Cooling System:	Air cooled	Liquid cooled	Air cooled	Air/Oil-cooled	Air cooled	Air cooled
Compression Ratio:	9.5:1	11.0:1	8.2:1	10.3:1	8.5:1	8.2:1
Induction:	2 x Constant depression carburettors, Bing 94/40/105 - 94/40/106	Electronic injection, Bosch Motronic	2 x constant depression carburetors, Bing V 94/40/111 - 94/40/112	Electronic injection, Bosch Motronic	2 x Bing carburetors	2 x Bing constant depression carburetors
Starting:	Electric	Electric	Electric	Electric	Electric	Electric
Max Power:	51 kW / 70 hp @ 7000 rpm	72.9 kW / 100 hp @ 8000 rpm (rear tyre: 70.1 k/w / 94.0 hp @ 8400 rpm)	48.8 kW / 66.6 hp @ 7000 rpm	36.4 kW / 50 hp @ 5250 rpm	44 kW / 60 hp @ 6500 rpm	37 kW / 50 hp @ 6500 rpm
Max Torque:	76 Nm / 7.7 kgf-m / 56 ft-lb @ 6000 rpm	100 Nm / 10.2 kgf-m / 74 ft lb @ 6750 rpm	72 Nm / 7.34 kgf-m / 53.1 lb-ft @ 5500 rpm	71 Nm / 7.2 kgf-m / 52 ft lb @ 4750 rpm	76 Nm / 7.75 kgf-m / 56 ft-lb @ 3750 rpm	61 Nm / 6.2 kgf-m / 44 ft lb @ 5000 rpm
Transmission:	5 Speed	5 Speed	5 Speed	5 Speed	5 Speed	5 Speed
Final Drive:	Shaft	Shaft	Shaft	Shaft	Shaft	Shaft
Front Suspension:	Telescopic fork with hydraulic shock absorber.	Telescopic fork with hydraulic shock absorber	Telescopic fork with hydraulic shock absorber.	Telelever fork with longitudinal control arm and central strut.	Telescopic fork with hydraulic shock absorber.	∅40mm Marzocchi telescopic hydraulic forks.
Rear Suspension:	Long swinging arm with adjustable strut.	Monolayer swinging arm	Long swinging arm with adjustable strut.	Monolever swinging arm	Paralever adjustable preload, rebound damping compression	BMW Paralever swinging arm
Front Brakes:	2 x ∅260mm discs 2 piston calipers	2 x ∅305mm discs, 4 piston calipers	Single 260mm disc	2 x ∅305mm discs, 4 piston calipers	Single ∅285mm disc, 2 piston caliper	Single ∅285mm disc
Rear Brakes:	Simplex ∅200 mm drum	Single ∅285mm disc, 1 piston caliper	200 Drum	Single ∅285mm disc, 2 piston caliper	∅200 Drum	∅200mm Drum
Front Tyre:	3.25 H-19	120/70 ZR17	3.25 - H19	100/90 - 18	90/90-21	90/90 x 21S
Rear Tyre:	4.00 H-18	160/60 ZR18	4.00 - H18	170/80 - B15	130/80-17	13/80 x 17S
Fuel Capacity:	24 Litres / 6.3 US gal	22 L / 5.8 US gal	24 L / 6.3 US gal	17 L / 4.4 US gal	24 L / 6.3 US gal	24 L / 6.3 US gal