Triumph TT600 (2003) vs KTM 390 SMC R (2025) vs Yamaha XZ 550 Vision (1982-83) vs Triumph Speed Triple Carbon Edition (2007) vs Harley-Davidson Harley Davidson FLTRX Road Glide Custom (2012) vs Yamaha DT 250 (1977) vs Maico GP400E (1977-87)

Comparison technical specifications

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Make:	Triumph	KTM	Yamaha	Triumph	Harley-Davidson	Yamaha	Maico
Model:	TT600	390 SMC R	XZ 550 Vision	Speed Triple Carbon Edition	Harley Davidson FLTRX Road Glide Custom	DT 250	GP400E
Years:	2003	2025	1982-83	2007	2012	1977	1977-87
Engine:	Four stroke, transverse four cylinder. DOHC, 4 valves per cylinder.	Four stroke, single cylinder, DOHC with finger followers, 4 valves	Four stroke, 70°V-twin cylinder. DOHC, 4 valve per cylinder	Four stroke, transverse three cylinder. DOHC, 4 valves per cylinder	Four stroke, V-Twin, Twin Cam 103™ Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters; two valves per cylinder, with Integrated Oil-Cooler	Two stroke, single cylinder	Single cylinder, two stroke
Capacity:	599 cc / 36.6 cu in	398.7 cc / 24.3 cu-in	552 cc / 33.7 lb-ft	1050 cc / 64.07 cu-in	1690 cc / 103.1 cu-in	246 cc / 15.0 cu-in	354 cc / 21.6 cub in.
Bore x Stroke:	68 x 41.3 mm	89 x 64 mm	80 х 55 mm	79 x 71.4 mm	98.4 x 111.1 mm	70 x 64 mm	77 x76 mm
Cooling System:	Liquid cooled	Liquid Cooled	Liquid cooled	Liquid-cooled	Air cooled	Air cooled	Air cooled
Compression Ratio:	12.5:1	12.6:1	10.4:1	12.0:1	9.6:1	6.8:1	13.5:1
Starting:	Electric	Electric	Electric	Electric	Electric	Kick	Kick
Transmission:	6 Speed	6 Speed	5 Speed	6 Speed	6 Speed	5 Speed	5-Speed
Final Drive:	Chain	Chain 520-X Ring	Shaft	Chain	Belt	Chain	Chain
Front Suspension:	43mm forks with dual rate springs and adjustable preload, compression and rebound damping	43mm WP APEX 43, open cartridge, compression and rebound adjustable	Telescopic oil damped forks	Showa 45 mm upside down forks with dual rate springs and adjustable preload, compression and rebound damping	41.3 mm telescopic, triple circuit damping	Oil-damped, coil-spring fork with forward-mounted axle and	Telescopic fork, steering damper
Rear Suspension:	Monoshock with adjustable preload, compression and rebound damping	WP APEX - Monoshock, split piston, rebound and preload adjustable	Gas filled monoshock, 2-way adjustable.	Showa monoshock with adjustable preload, compression and rebound damping	Air-adjustable, Swingarm Mild steel; two-piece drawn and welded section; forged juctions; MIG welded	DeCarbon-type, nitrogen-charged mono-shock producing	Twin shocks with coil spring
Front Brakes:	2x 310 mm Discs, 4 piston calipers	Single 320 mm disc, Bybre 2 piston radial caliper	2x 266mm discs	2 x 320 mm Discs, 4 piston calipers, Brembo	2x 300mm discs 4 piston calipers	Conical hub with drum brake	Single disc
Rear Brakes:	Single 220mm disc, 1 piston caliper	Single 240 mm disc, Bybre 1 piston floating caliper	Single 177mm drum	Single 220 mm disc, 2 piston caliper, Brembo	Single 300mm discs 4 piston caliper	Conical hub with rod-actuated drum brake	Single disc
Fuel Capacity:	18 Litres / 4.8 US gal / 4.0 Imp gal	9 L / 2.4 US gal	17 Litres / 4.4 US gal	18 Litres / 4.89 gal	22.7 Litres / 6 US gal	8.5 Litres / 2.2 gal	10 L /2.64 US gal