Aprilia RS4 125

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Aprilia RS4 125
Manufacturer Aprilia
Parent company Piaggio
Production since 2011
Predecessor Aprilia RS125
Class sport bike
Engine 124.8 cc (8 cu in) Single-Cylinder DOHC[1] four-stroke
Transmission 6 speed, multi-disk oil bath clutch
Brakes Front: Dual 320 mm diameter floating discs, Brembo monobloc radial 4-piston calipers
Rear: 220 mm diameter disc, Brembo 2-piston calipers
Tires Front: 100/80 - 17",
rear: 130/70 - 17"
Wheelbase 1350 mm
Dimensions L: 1953 mm
W: 740 mm
H: 1138 mm
Seat height 820 mm (32 in)
Fuel capacity 14.5 L (3.2 imp gal; 3.8 US gal)
Reserve: 3.5 L (0.77 imp gal; 0.92 US gal)
Related Aprilia RS125, Aprilia RS4 50

The Aprilia RS4 125 is a 125cc class sportbike manufactured by Italian motorcycle firm Aprilia. The RS4 125 is a four-stroke variant of the extremely popular RS125 two-stroke race replica. It is marketed as a tamer, more practical option to the more aggressive, track-oriented RS125. The bike is based on the four-stroke version of the Derbi GPR125.[2] A race kit is available from the manufacturer that boosts power from the standard 15 bhp to 25 bhp.[3]


The RS4 125 is available with a quick-shift system similar to the RSV4, in which the engine halts the torque from the engine based on engine rpm, the amount of throttle being applied, and the speed of the bike. This system allows smooth, fast upshifts without the use of the clutch. The chassis is very high-spec, with an aluminium perimeter frame and aluminium swingarm. The brakes are also high-spec, with a 30 cm steel disc in front with a four-piston radial caliper and a 22 cm steel disc with a single caliper at the rear.

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