Aprilia RS 660 / Factory (2025) vs Indian Springfield Special Edition (2025) vs Indian Super Chief Dark Horse (2025) vs Aprilia Tuono 457 (2025) vs Horex Regina 250 (1955-60) vs Horex VR6 Classic (2014) vs Horex VR6 Roadster (2013)

Comparison technical specifications

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Make:	Aprilia	Indian	Indian	Aprilia	Horex	Horex	Horex
Model:	RS 660 / Factory	Springfield Special Edition	Super Chief Dark Horse	Tuono 457	Regina 250	VR6 Classic	VR6 Roadster
Years:	2025	2025	2025	2025	1955-60	2014	2013
Engine:	Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder	Thunder Stroke 116, 49˚ V-Twin	Thunderstroke 116	Four stroke, forward facing parallel twin, DOHC with silent chain drive on the right side, four valves per cylinder	Four stroke, single cylinder.	Four stroke, V6, 15 degree V-angle mirrored cylinder offset, triple overhead cam, 3 valves per cylinder	Four stroke, V6, 15 degree V-angle mirrored cylinder offset, triple overhead cam, 3 valves per cylinder
Capacity:	659 cc / 40.2 cu-in	1890 cc / 115 cub in	1890 cc / 116 cu-in	457 cc / 27.9 cu in	249 cc / 15.1 cu-in	1218 cc / 74.32 cu-in	1218 cc / 74.32 cu-in
Bore x Stroke:	81 x 63.93 mm	103.2 x 113 mm	103.2 x 113 mm	69 x 61.1 mm	69 x 91,5 mm	68.2 x 55.4 mm	68.2 x 55.4 mm
Compression Ratio:	13.5: 1	11.0:1	11.0:1	n/a	6.35:1	12.5:1	12.5:1
Induction:	Airbox with front air intake. 2 x 52 mm throttle bodies, Ride-By-Wire management	Electronic fuel injection, closed loop, 54 mm bore	Electronic Fuel Injection System Closed loop fuel injection / 54 mm bore	Fuel injection	Carburetor		Turbo. Rotrex radial compressor C-series, detatchable
Starting:	Electric	Electric	Electric	Electric	Kick	Electric	Electric
Transmission:	6 Speed, Aprilia Quick Shift (AQS) System up and down (available as optional accessory)	6 Speed	6 Speed	6 Speed	4 Speed	6 Speed	6 Speed
Final Drive:	Chain, with drive ratio: 17/43	Belt, 152 tooth	Belt	Chain	Chain	Chain	Chain
Front Suspension:	RS: ? 41 mm Kayaba USD fork, rebound and preload adjustable RS Factory: 43mm ?hlins NIX 30 fork, spring preload, rebound and compression damping adjustable	46mm Telescopic forks	46mm Telescopic fork	? 41mm USD fork, adjustable preload	Hydraulic telescopic forks	Öhlins upside-down fork (Ø 43 mm) with adjustable spring preload, compression and rebound damping	USD fork,fixed tube Ø 48 mm
Rear Suspension:	RS: Kayaba monoshock, rebound and preload adjustable?hlins STX rear shock, spring preload, rebound and compression damping adjustable RS Factory: ?hlins monoshock, fully adjustable	Single shock with air adjust	Dual shocks with adjustable preload	Monoshock, adjustable preload	Dual shocks	Öhlins TTX36 GP suspension struts with adjustable spring base, rebound and compression damping and built-in hydraulic spring preload adjustment	Swingarm with central spring strut
Front Brakes:	2x 320mm Brembo radial calipers with 4 horizontally opposed 32 mm pistons. Radial pump and metal braided brake hose	2 x 300mm Floating rotor, 4 piston calipers	Single 300 mm semi-floating rotor 4 piston caliper	Single ? 320 mm floating disc. ByBre 4-piston radial caliper	150mm Drum	2x 320mm disc. ABS. Radial 4-piston calipers. Bremo.	2x 320mm disc. ABS. Radial 4-piston calipers. Bremo.
Rear Brakes:	Single 220mm disc; Brembo caliper with two 34 mm separate pistons. Master cylinder with separate reservoir and metal braided hose Multimap ABS (Cornering ABS available as optional accessory)	Single 300mm floating rotor, 2 piston caliper	Single 300 mm floating rotor 2 piston caliper	Single ? 220 mm disc. ByBre caliper	150mm Drum	Single 264mm disc. ABS. 2-piston caliper. Bremo	Single 264mm disc. ABS. 2-piston caliper. Bremo
Front Tyre:	120/70 ZR 17	130/60B19 65H Metzeler Cruisetec	130/90B16 67H	110/70-17	3.25 -19	120/70-ZR17	120/70-ZR17
Rear Tyre:	180/55 ZR 17	180/60R16 80H Metzeler Cruisetec	180/65 B16 81H	150/60-17	3.50 -19	190/55-ZR17	190/55-ZR17
Fuel Capacity:	15 Litres / 4.0 US gal	20.8 Litres / 5.5 US gal	15.1 Litres / 4.0 US gal	12.7 l / 3.4 US gal	13.5 Litres / 3.5 US gal	17 Litres / 4.5 USA gal	17 Litres / 4.5 USA gal