14 August. Friday 2026
Aprilia RS4 125 - 2011 Specifications and Reviews
The 2011 Aprilia RS4 125 is a lightweight sport bike engineered for new riders and commuters seeking genuine sportbike styling with manageable performance. Its fuel-injected single-cylinder engine delivers 16 horsepower with efficient liquid cooling and six-speed transmission, making it ideal for learning track fundamentals or daily urban riding.
Intresting Fact:
At the point the RS4 125 was launched over 100,000 of its predecessor (RS125) had been sold
Replacement for the: 2011 Aprilia RS125
About the Aprilia RS4 125
Launched in 2011, the four stroke RS4 125 is the bigger brother to the Aprilia RS4 50 and is based on the Derbi GPR125.
A race kit is available which boosts the power from 14.8bhp to 25bhp.
Styling is based on the RSV4 superbike. There is also an optional RSV4 style quick shift system available.
General information | |
| Category | Sport |
| Year | 2011 |
| Model | Aprilia RS4 125 |
| | |
Engine and Transmission Specifications | |
| Driveline | Primary drive: Gearbox: 63/19 (3.31). Final drive: Chain: 17/40 (2.35). |
| Clutch | Multi-plate in oil bath. |
| Transmission type,final drive | Chain |
| Gearbox | 6-speed |
| Cooling system | Liquid |
| Lubrication system | Wet sump |
| Ignition | CDI |
| Fuel control | DOHC |
| Fuel system | Injection |
| Valves per cylinder | 4 |
| Bore x stroke | 58.0 x 47.0 mm (2.3 x 1.9 inches) |
| Compression | 12.5:1 |
| Power | 16.04 |
| Engine type | Single cylinder, four-stroke |
| Capacity: | 124.80 ccm (7.62 cubic inches) |
| | |
Brakes, suspension, Frame and wheels | |
| Wheels | Aluminium alloy. Front 3.00 x 17"; rear 4,00 x 17". |
| Rear brakes diameter | 220 mm (8.7 inches) |
| Rear brakes | Single disc |
| Front brakes diameter | 300 mm (11.8 inches) |
| Front brakes | Single disc |
| Rear tyre dimensions | 130/70-R17 |
| Front tyre dimensions | 110/80-R17 |
| Rear suspension travel | 130 mm (5.1 inches) |
| Rear suspension | Swingarm. Hydraulic monoshock with adjustable spring preload. |
| Front suspension travel | 110 mm (4.3 inches) |
| Front suspension | Upside down hydraulic fork, 40 mm. |
| Frame type | aluminium, Single cradle frame |
Physical measures and capacities | |
| Fuel capacity | 14.50 litres (3.83 gallons) |
| Wheelbase | 1,350 mm (53.1 inches) |
| Overall width | 740 mm (29.1 inches) |
| Overall length | 1,955 mm (77.0 inches) |
| Seat height | 820 mm (32.3 inches) If adjustable, lowest setting. |
| Weight incl. oil, gas, etc | 120.0 kg (264.6 pounds) |
Other specs | |
| Maintenance | Find parts, fluids, filters, maintenance tools and service items on eBay |
| Color options | Red/black |
| Starter | Electric |
Performance Profile & Rider Fit
15 hp
Peak Power
12.5s
0-60 mph
Best For
Track70%
City75%
Cornering90%
Daily Riding60%
Touring25%
Passenger20%
Rider Profile
| Best For | This is an ideal bike for new or learner riders, including those on a restricted license, thanks to its light weight and modest power output. |
| Purpose | Built as a sporty, race-replica styled machine for learning proper sportbike ergonomics and cornering technique at accessible speeds. |
| Rider Fit | Its low 120 kg weight and compact dimensions make it very manageable for smaller or less experienced riders, though the sporty seat height and committed riding position suit shorter to average-height riders best. |
| Character | A nimble, high-revving little sportbike that rewards momentum-carrying, corner-focused riding rather than straight-line speed. |
| Not Ideal For | This is not the right bike for experienced riders seeking real power, highway touring comfort, or two-up long-distance travel. |
Character map is an editorial estimate based on this bike's specifications, not a lab-tested measurement.
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