Gilera KZ 125 (1988-89) vs Yamaha SR 500 (1974-75) vs Triumph America (2017-18) vs Triumph Street Triple 765RS (2019) vs BMW S 1000RR (2018)

Comparison technical specifications

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Make:	Gilera	Yamaha	Triumph	Triumph	BMW
Model:	KZ 125	SR 500	America	Street Triple 765RS	S 1000RR
Years:	1988-89	1974-75	2017-18	2019	2018
Engine:	Two stroke, single cylinder, reed valve	Four stroke, single cylinder, SOHC, 2 valves per cylinder.	Four stroke, parallel twin cylinder, DOHC, 4 valves per cylinder, 360° firing interval	Four stroke, in-line 3-cylinder, DOHC, 4 valve per cylinder	Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder
Capacity:	124 ccc / 7.6 cu-in	499 cc / 30.4 cu-in	865 cc / 52.8 cub in.	765 cc / 46.6 cu-in	999 cc / 60.9 cu-in
Bore x Stroke:	56 x 50.5 mm	87 х 84 mm	90 x 68 mm	78 x 53.4 mm	80 x 49.7 mm
Cooling System:	Liquid cooled	Air cooled	Air-cooled	Liquid-cooled	Liquid cooled
Compression Ratio:	13.0;1	9.0:1	9.2:1	12.65:1	13.0:1
Starting:	Electric	Kick	Electric	Electric	Electric
Max Power:	29.3 hp / 21.8 kW @ 9900 rpm	31.5 hp / 23.5 kW @ 6500 rpm	45.5 kW / 61 hp @ 6800 rpm	121 hp / 90 kW @ 11,700rpm	146 kW / 199 hp @ 13500 rpm
Max Torque:	18 Nm / 13.2 lb-ft @ 10250 rpm	36.3 Nm / 26.8 lb-ft @ 5500 rpm	72 Nm / 7.34 kgf-m / 53.1 ft-lb @ 3300 rpm	56.8 lb-ft / 77 Nm @ 10,800 rpm	113 Nm / 11.5 kgf-m / 83.3 lb-ft @ 10500 rpm
Transmission:	6 Speed	5 Speed	5 Speed	6 Speed, close ratio	Constant-mesh 6-speed gearbox, straight-toothed
Final Drive:	Chain	Chain	Chain, X-ring	O ring chain	Chain 17/45
Frame:	Diagonal double cradle tubular steel	Half-duplex cradle	Tubular steel cradle, swing arm: twin-sided, tubular steel	Front – Aluminium beam twin spar. Rear – 2 piece high pressure die cast	Aluminium composite bridge frame, partially self-supporting engine
Front Suspension:	Fork traditional 36mm. Antidive adjustable	35mm telescopic forks	41mm Kayaba telescopic forks, polished stainless steel shrouds	Showa 41 mm upside down big piston forks (BPF). Adjustable compression damping, rebound damping and preload.	Upside-down telescopic fork Ø 46 mm, compression and rebound stage adjustable
Rear Suspension:	Hydraulic shock absorber adjustable in spring preload Court Cosso	Dual shock, 5-way adjustable spring preload.	Kayaba chrome spring twin shocks with adjustable preload	Öhlins STX40 piggyback reservoir monoshock. Adjustable spring preload (lock-rings), compression damping and rebound damping	Aluminium double-strut swingarm, compression and rebound damping adjustable
Front Brakes:	Single 240mm disc 2 piston caliper	Single 200mm disc	Single 310 mm disc, Nissin 2 piston floating caliper	2 x 310 mm floating discs, Brembo M50 4-piston radial monobloc calipers	2 x 320mm Discs, 4 piston calipers
Rear Brakes:	Single 240mm disc	150mm drum	Single 285 mm disc, Nissin 2 piston floating caliper	Single 220 mm fixed disc, Brembo single piston sliding calliper	Single 220mm disc, 1 piston caliper
Front Tyre:	100/80-16	3.50 S19	130/90 - 16	120/70 ZR17 Pirelli Diablo Supercorsa SP	120/70 ZR17
Rear Tyre:	120/80-16	4.00 S18	170/80 B15	180/55 ZR17 Pirelli Diablo Supercorsa SP	180/55 ZR17
Seat Height:	760 mm / 29.9 in	810 mm / 32 in	690 mm / 27.2 in	825 mm / 32.4 in	815 mm / 32.0 in.
Fuel Capacity:		12 Litres / 3.1 US gal	19.3 Litres / 5.1 US gal / 4.2 Imp gal	17.4 Litres / 4.6 US gal / 3.8 Imp gal	17.5 Litres / 4.6 US gal.