Triumph 6T Thunderbird (1950-53) vs Triumph Speed Twin (2019) vs Suzuki GSX-R 400 (1986) vs Harley-Davidson Harley Davidson VRSCA V-Rod 100th Anniversary Edition (2003) vs Harley-Davidson Harley Davidson Street Glide Special 115th Anniversary (2018)

Comparison technical specifications

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Make:	Triumph	Triumph	Suzuki	Harley-Davidson	Harley-Davidson
Model:	6T Thunderbird	Speed Twin	GSX-R 400	Harley Davidson VRSCA V-Rod 100th Anniversary Edition	Harley Davidson Street Glide Special 115th Anniversary
Years:	1950-53	2019	1986	2003	2018
Engine:	Four stroke, vertical twin, OHV	Four stoke, parallel twin, 270o crank, SOHC, 4 valve per cylinder	Four stroke, transverse four cylinder, DOHC 4 valves per cylinder. TSCC	Four stroke, 60° V-twin, DOHC, 4 valve per cylinder	Four stroke, V-Twin, Milwaukee-Eight 107, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder
Capacity:	649 cc / 40.0 cu in	1198 cc / 73.1 cu in	398 cc / 24.3 cu-in	1130 cc / 59 cu-in	1746 cc / 107 cub in
Bore x Stroke:	71 x 82 mm	97.6 x 80 mm	53 x 45.2 mm	100 x 72 mm	100 x 111 mm / 3.937 x 4.374 in
Cooling System:	Air cooled	Liquid cooled	Liquid cooled	Liquid cooled	Air cooled
Compression Ratio:	8.5:1 (Export), 7.0:1 (UK)	11.0:1	11.5:1	11.3:1	10.0:1
Induction:	1 x Amal Monobloc, 25 mm (1953: SU type MC2)	Multipoint sequential electronic fuel injection	2 x AS27VW carburetors	Sequential Port Electronic fuel injection with 53mm throttle bodies	Electronic Sequential Port Fuel Injection (ESPFI)
Ignition:	Lucas magneto	Digital	CDI	Sequential, single fire non waste spark, coil on plug	Single-fire, non-wasted, map-controlled spark ignition
Starting:	Kick	Electric	Electric	Electric	Electric
Clutch:	Wet, multiplate	Wet, multi-plate assist clutch	Wet multi-plate	Nine plate wet pressure fed with integral compensation	Hydraulically actuated 9 plate wet, Assist & Slip
Transmission:	4-Speed constant mesh	6-Speed	6 Speed, constant mesh	5 Speed	6 Speed
Final Drive:	Chain, 101 links	Chain, X-ring	Chain	Belt	Belt
Frame:	Brazed lug	Tubular steel with aluminum cradle	Aluminum angular pipe double cradle	Steel perimeter upper frame w/ hydroformed main rails and bolt-on lower frame rails Swing Arm One piece cast aluminum polished	Mild steel, square-section backbone with twin downtubes
Front Suspension:	Telescopic fork, hydraulic damping	41mm cartridge forks	Telescopic forks	Huge 49mm telescopic forks	41.3 mm telescopic, cartridge-style damping,
Rear Suspension:	Rigid, spring loaded saddle	Twin-sided, aluminum swingarm, twin shocks with adjustable preload	Full floater swing arm, non-adjustable	Dual coil over adjustable shock	Short, air-adjustable shock,
Front Brakes:	SLS drum, 7 in	2 x 305 mm discs, Brembo 4-piston fixed calipers, ABS	2 x Discs, 4 piston calipers	2x 292mm discs 4 piston calipers	Caliper Type 32 mm, 4-piston fixed
Rear Brakes:	SLS drum, 7 in	Single 220 mm disc, Nissin 2-piston floating caliper, ABS	Single disc, 2 piston caliper	Single 292mm disc 4 piston caliper	Caliper Type 32 mm, 4-piston fixed
Wheelbase:	1403 mm / 55.25 in	1430 mm / 56.3 in	1425 mm / 56.1 in	1713 mm / 67.5 in	1625 mm / 64 in
Seat Height:	775 mm / 31 in	807 mm / 31.8 in	780 mm / 30.7 in	659.9 mm / 26.0 in - 687.8 mm / 27.1 in	Laden 7 663 mm / 26.1 in Unladen 690 mm / 27.2 in
Dry Weight:	168 kg / 370 lbs	196 kg / 432 lbs	152 kg / 334 lbs	270.4 kg / 595 lbs	362 kg / 798 lbs
Fuel Capacity:	13.6 L / 3.6 US gal / 3.0 Imp gal (US), 18 L / 4.8 US gal / 4.0 Imp gal (UK and export)	14.5 Litres / 3.8 US gal	15 Litres / 3.96 US gal / 3.3 Imp gal	15 Litres / 4.0 US gal	22.7 Litres / US 6.0 gal