BMW R 45 (1982-85) vs BMW K 1200LT (1999-02) vs BMW R 1250RT (2021) vs BMW R 80G/S (1982) vs BMW R 100RS (1982-83) vs BMW R 1250RS (2021)

Comparison technical specifications

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Make:	BMW	BMW	BMW	BMW	BMW	BMW
Model:	R 45	K 1200LT	R 1250RT	R 80G/S	R 100RS	R 1250RS
Years:	1982-85	1999-02	2021	1982	1982-83	2021
Engine:	Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.	Four stroke, horizontal in line four cylinder, DOHC, 4 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, with two overhead, spur gear driven camshafts , a counterbalance shaft and variable intake camshaft control system BMW ShiftCam, 4 valves per cylinder, Intake 40mm, outlet 34 mm	Four stroke, two cylinder horizontally opposed Boxer, pushrod operated 2 valves per cylinder.	Four stroke, two cylinder horizontally opposed Boxer, 2 valves per cylinder	Four stroke, two cylinder horizontally opposed Boxer, with two overhead, spur gear driven camshafts , a counterbalance shaft and variable intake camshaft control system BMW ShiftCam, 4 valves per cylinder, Intake 40mm, outlet 34 mm
Capacity:	453 cc / 27.6 cu in.	1172 cc / 71.5 cu in	1254 cc / 76.5 cu-in	797.5 cc / 48.7 cu in.	980 cc / 59.8 cub in.	1254 cc / 76.5 cu-in
Compression Ratio:	8.2:1	10.8:1	12.5:1	9.2:1	9.5:1	12.5:1
Cooling System:	Air cooled	Liquid cooled	Liquid / Air cooled	Air cooled	Air cooled	Liquid / Air cooled
Induction:	2 x Bing V65 carburetors	Electronic intake pipe injection	Electronic intake pipe fuel injection, 52mm throttle valve	2 x Bing constant depression carburetorss	2 x Constant depression carburettors, Bing 94/40/105 - 94/40/106	Electronic intake pipe fuel injection, 52mm throttle valve
Max Power:	20 kW / 27 hp @ 6500 rpm	72 kW / 98 hp @ 6750rpm	136 hp / 100 kW @ 7750 rpm	37 kW / 50 hp @ 6500 rpm	51 kW / 70 hp / @ 7000 rpm	136 hp / 100 kW @ 7750 rpm
Max Torque:	37.5 Nm 3.8 kgf-m / 27.65 lb-ft @ 5500 rpm	115 Nm / 11.7 kgf-m / 84 ft-lb @ 4750 rpm	143 Nm / 105.4 lb-ft @ 6250 rpm	56.7 Nm / 5.8 kgf-m / 41 ft lb @ 5000 rpm	76 Nm / 7.75 kgf-m / 56 ft-lb @ 6000 rpm	143 Nm / 105.4 lb-ft @ 6250 rpm
Transmission:	5 Speed	5 Speed	6-speed helical synchromesh gearbox	5 Speed	5 Speed	Constant mesh 6-speed gearbox with helical gearing system
Final Drive:	Shaft	Shaft	Shaft	Shaft	Shaft	Shaft
Front Suspension:	Telescopic hydraulic forks	Motorrad Telelever, stanchion diameter ∅35 mm, central strut	BMW Motorrad 37mm Telelever, central spring strut	Telescopic hydraulic forks	Telescopic fork with hydraulic shock absorber.	Telescopic Upside-Down fork; stanchion diameter 45 mm
Rear Suspension:	Long swinging arm with adjustable strut	Die cast Aluminum single sided swinging arm with Paralever, central strut, spring preload adjustable to continuously variable levels by mean of hydraulic hand wheel	Cast aluminium single-sided swinging arm with BMW Motorrad Paralever, WAD spring strut, spring preload continuously and hydraulically adjustable via adjuster knob, adjustable rebound-stage damping via adjuster knob	Monolever swinging arm	Long swinging arm with adjustable strut.	Cast aluminium single-sided swing arm with BMW Motorrad Paralever; WAD strut (travel- related damping), spring pre-load hydraulically adjustable (continuously variable) at handwheel, rebound damping adjustable at handwheel
Front Brakes:	2 x ∅260mm Discs, 2 piston caliper.	2 x ∅320mm disc, 4 piston calipers, ABS	2x 320mm floating discs, 4-piston radial brake calipers	Single ∅260mm disc	2 x ∅260mm discs, 2 piston calipers	2x 320mm floating discs, 4-piston radial brake calipers
Rear Brakes:	Single ∅200mm drum	Single ∅285mm disc, 2 piston caliper, ABS	Single 276mm disc, 2-piston floating caliper	∅200mm Drum	Simplex ∅200 mm drum	Single 276mm disc, 2-piston floating caliper
Front Tyre:	1.85 - B18	120/70 ZR17	120/70 ZR17	3.00 - 21	3.25 - H19	120/70 ZR17
Rear Tyre:	2.50 - B18	160/70 ZR17	180/55 ZR17	4.00 - 18	4.00 - H18	180/55 ZR17
Fuel Capacity:	22 Litres / 5.8 US gal	22 L / 5.8 US gal	25 Litres / 6.6 US gal	19.5 L / 5.1 US gal	24 Litres / 6.3 US gal	18 Litres / 4.7 US gal