KTM Comet 125 RS (1976) vs Gilera RC 600C (1992-) vs Suzuki RG 250 Gamma (1985) vs Aprilia RS 125 R Max Biaggi Superbike Replica (2010) vs KTM 690 Duke (2014) vs Harley-Davidson Harley Davidson Softail Fat Bob 107 (2020)

Comparison technical specifications

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Make:	KTM	Gilera	Suzuki	Aprilia	KTM	Harley-Davidson
Model:	Comet 125 RS	RC 600C	RG 250 Gamma	RS 125 R Max Biaggi Superbike Replica	690 Duke	Harley Davidson Softail Fat Bob 107
Years:	1976	1992-	1985	2010	2014	2020
Engine:	Single cylinder, two stroke	Four stroke, single cylinder, DOHC, 4 valves	Two stroke, parallel twin, reed valve	Single cylinder, two stroke, reed valves induction, aluminium cylinder with Nikasil coated liner	Four stroke, single cylinder, SOHC, 4 valves	Four stroke, V-Twin, Milwaukee-Eight 107, Pushrod-operated, overhead valves with hydraulic, self-adjusting lifters, 4 valves per cylinder
Capacity:	124 cc / 7.57 cu in	558 cc / 34.0 cu-in	247 cc / 15.1 cu in	124.8 cc / 7.5 cu in	690 cc / 42.1 cu in	1746 cc / 107 cub in
Bore x Stroke:	54 x 54 mm	98 x 74 mm	54 x 54 mm	54 x 54.5mm	102 x 84.5 mm	100 x 111 mm
Compression Ratio:	11.8:1	10.5:1	7.4 :1	12.5:1	12.6:1	10.0:1
Cooling System:	Air cooled	Liquid cooled	Liquid cooled	Liquid cooled	Liquid Cooled	Air cooled
Induction:	Carburetor	2x 30mm carburetor	2 x Mikuni VM28SS flat side carburetors	Dell'Orto PHBH 28 carburetor	Generation Keihin EMS with EPT (Electric Power Throttle)	Electronic Sequential Port Fuel Injection (ESPFI)
Starting:	Kick	Electric	Kick	Electric	Electric	Electric
Final Drive:	Chain	Chain	Chain, #520, 110 links, O-ring sealed	17:40	Chain X-Ring 5/8 x 5/16"	Belt
Front Suspension:	Telescopic fork	41mm Morzocchi forks	Telescopic fork, coil spring, oil dampened with anti-dive	Upside-down forks, Ø 40mm	WP Upside-down forks, 4357 ROMA	Showa Inverted forks
Rear Suspension:	Twin shocks springs	Boge shocks variable preload	Full Floater, mono-shock, gas/oil damped, spring preload fully adjustable	Monoshock, cast aluminium box section swingarm with asymmetric members	WP monoshock, 4618 with Pro-lever deflector	Mono shock adjustable
Front Brakes:	Single disc	Single 260mm disc	2 x 260 mm Discs ,1 piston caliper	Single 320 mm floating discs, 4 piston radial caliper	Single 320 mm floating disc, radially screwed four-piston brake caliper	2 x Disc, 4 piston caliper
Rear Brakes:	Single disc	Single 220mm disc	Single 210 mm disc, 1 piston caliper	Single 220 mm disc, 2 piston caliper	Single 240 mm floating disc, single piston caliper	Single disc, 2 piston floating caliper
Front Tyre:	2.75 x 17	90/90 -21	100/90-16	110/70-17	120/70 - ZR17 M/C 58W TL	150/80-16,71H,BW
Rear Tyre:	3.00 x 17	130/80 -17	100/80-18	150/60-17	160/60 - ZR17 M/C 69W TL	180/70B16,77H,BW
Fuel Capacity:	9.5 L / 2.5 US gal / 2.1 Imp gal	12 Litres / 3.17 US gal	17 Litres / 4.5 US gal / 3.7 Imp gal	14 Litres / 3.7 US gal	14 Litres / 3.7 US gal / 3.1 Imp gal	13.6 Litres / US 3.6 gal