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)

Comparison technical specifications

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Make:	Aprilia	Indian	Indian	Aprilia	Horex
Model:	RS 660 / Factory	Springfield Special Edition	Super Chief Dark Horse	Tuono 457	Regina 250
Years:	2025	2025	2025	2025	1955-60
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.
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
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
Compression Ratio:	13.5: 1	11.0:1	11.0:1	n/a	6.35:1
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
Starting:	Electric	Electric	Electric	Electric	Kick
Transmission:	6 Speed, Aprilia Quick Shift (AQS) System up and down (available as optional accessory)	6 Speed	6 Speed	6 Speed	4 Speed
Final Drive:	Chain, with drive ratio: 17/43	Belt, 152 tooth	Belt	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
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
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
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
Front Tyre:	120/70 ZR 17	130/60B19 65H Metzeler Cruisetec	130/90B16 67H	110/70-17	3.25 -19
Rear Tyre:	180/55 ZR 17	180/60R16 80H Metzeler Cruisetec	180/65 B16 81H	150/60-17	3.50 -19
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