Two middleweights that are not trying to be the same bike
Put the MV Agusta F3 RR and Aprilia RS 660 in the same conversation and the word middleweight starts doing rather a lot of work. Both are Italian, fully faired sport bikes. Both have serious chassis hardware, current electronic rider aids and specifications that place them firmly in the modern performance-bike conversation. Yet they are not two versions of the same answer.
The F3 RR centres its identity on a 798 cc three-cylinder engine, high peak output and a carefully specified sporting chassis. The standard RS 660 takes a different route: a 659 cc parallel twin, less peak power and a design intended to combine sporting performance with a broader road-going brief. That is a difference in mechanical approach, not merely badge, styling or cylinder count.
The numbers make the gap unmistakable. MV Agusta quotes 147 hp for the standard F3 RR; Aprilia quotes 105 hp for the standard RS 660. Both are legitimate middleweight search results. That does not make them direct performance or racing-class equivalents.
The better question is what each manufacturer has chosen to emphasise — and how those decisions become visible in the engine, chassis, electronics and bodywork.
Triple versus twin: the difference starts inside
The F3 RR uses a liquid-cooled 798 cc three-cylinder engine with four valves per cylinder. MV Agusta quotes 147 hp at 13,000 rpm and 88 Nm at 10,100 rpm in its MY26 standard road specification. Its engine management uses ride-by-wire throttle control, with an electronic quickshifter for both upshifts and downshifts.
The RS 660 uses a liquid-cooled 659 cc parallel twin, likewise with four valves per cylinder and ride-by-wire. Aprilia quotes 105 hp at 10,400 rpm and 70 Nm at 8,400 rpm for the current standard machine.
Those peak figures describe very different output targets. The MV makes its quoted maximum power 2,600 rpm higher and carries a 42 hp advantage in stated peak output. Its torque peak also arrives higher in the rev range. The Aprilia's quoted maximum torque arrives at 8,400 rpm rather than 10,100 rpm.
None of this tells us that one bike is stronger at every road speed or in every gear. Peak power and torque alone cannot describe a complete delivery curve. Gearing, calibration, throttle response and the rider's chosen gear all matter. What the figures do establish is that the F3 RR's standard engine is tuned for substantially greater peak output, while the RS 660 belongs to a less extreme performance bracket.
The cylinder layouts deserve the same care. A triple does not automatically guarantee a particular character, and a twin is not automatically more usable. These are two distinct engine designs with their own quoted outputs, rather than an abstract triple-versus-twin contest decided by folklore.
The performance gap is real — but it is not the whole comparison
MV Agusta's MY26 technical sheet lists a 240 km/h maximum speed for the F3 RR, with a note that the speed was attained on a closed course. That figure alone does not establish a head-to-head speed advantage: a measured comparison would need equivalent machines, conditions and reporting bases.
Mass requires even more restraint. MV quotes 192.5 kg in running order without fuel for the standard F3 RR. Aprilia quotes 183 kg wet for the standard RS 660, with fluids, standard equipment and at least 90 per cent of usable fuel included under the stated EU basis. Subtracting one figure from the other would compare different conditions. Nor is it sound to calculate a definitive power-to-weight contest from those unmatched numbers.
The F3 RR has a larger quoted tank — 16.5 litres against the Aprilia's 15 litres — but neither fuel capacity nor dry-ish mass should be used as a shortcut to a precise ride-ready comparison.
The genuine story is already interesting enough. The MV offers a markedly higher standard peak-power figure. The Aprilia has a materially smaller engine and a different overall design target. Neither conclusion needs an invented weight advantage or a misleading top-speed race.
There is also a separate MV Agusta configuration to keep out of the road-bike figures. The dedicated F3 RR kit raises the quoted output to 155 hp and brings a separately quoted mass figure. Those numbers are not the standard motorcycle in this comparison. The same rule applies at the Aprilia end: the RS 660 Factory is not the standard RS 660.
Chassis, suspension and brakes: two different ways to build a sport bike
The F3 RR's frame uses a steel tubular trellis structure with aluminium-alloy swingarm pivot plates, and the motorcycle has a single-sided aluminium swingarm. At the front is a 43 mm Marzocchi upside-down fork, adjustable for compression, rebound and spring preload; a Sachs rear shock supplies the rear suspension adjustment.
Aprilia builds the RS 660 around a twin-spar aluminium frame. The standard motorcycle uses a 41 mm Kayaba upside-down fork with rebound and preload adjustment, and a Kayaba rear shock with the same two stated adjustment categories. The RS 660 Factory's Öhlins equipment is a separate specification and is not being borrowed here.
That contrast is more informative than a generic claim that either chassis is superior. They differ in frame construction, swingarm layout, supplier and listed adjustment range. Those are real differences in the hardware the manufacturers deliver, but a specification sheet cannot turn them into a measured verdict on feel or lap time.
Braking hardware shows both overlap and distinction. Both manufacturers list twin 320 mm front discs and radial Brembo front callipers. MV names Brembo Stylema radial monobloc callipers for the F3 RR; Aprilia's standard RS 660 sheet identifies Brembo radial callipers without applying that same Stylema name. Both list a 220 mm rear disc.
The dimensions of their cast wheels are strikingly similar: 17 x 3.5 inches at the front and 17 x 5.5 inches at the rear. MV explicitly publishes 120/70 front and 180/55 rear tyre sizes for the MY26 F3 RR. The current Aprilia standard technical sheet used here does not give equivalent tyre sizes, so the article does not invent a precise tyre-model comparison.
Suspension travel makes another useful comparison without overstating what it means. MV lists 125 mm front and 130 mm rear; Aprilia lists 120 mm front and 130 mm rear. Even a five-millimetre front-travel difference should not be mistaken for a complete account of suspension character.
Aerodynamics and riding position: intent you can see
Both motorcycles are fully faired, but the bodywork is not merely decoration. MV's F3 RR uses a distinctive fairing with aerodynamic elements and a focused sport-bike silhouette. Aprilia's updated RS 660 fairing also incorporates aerodynamic winglets, which Aprilia says are intended to increase stability. Neither fact, by itself, quantifies real-world cornering speed or establishes a winner in airflow management.
Their ergonomics require the same discipline. Both place the rider in a sporting relationship to a faired motorcycle; their seats, tanks, handlebars and footrests form different complete packages. The F3 RR lists an 830 mm saddle height, compared with 820 mm for the RS 660. Ten millimetres does not establish which motorcycle will fit an individual rider or how comfortable either will feel after an hour.
Aprilia presents the RS 660 as a sports middleweight designed for sporting riding without treating maximum engine output as its sole purpose. MV's F3 RR places more emphasis on high peak output and a detailed supersport-style hardware package. Those are manufacturer and hardware positions, not a claim that we have road-tested both back to back.
The distinction matters for a reader deciding what the category label conceals. A full fairing and Italian badge do not make these machines interchangeable. The F3 RR reaches towards a more highly tuned, highly specified performance proposition. The RS 660 approaches a sporty road motorcycle through a smaller twin, aluminium chassis and comprehensive electronics.
Electronics: neither bike is stripped back
A sizeable power gap does not mean only the more powerful machine gets modern electronic support.
The F3 RR's MY26 sheet lists torque control with four maps, eight traction-control intervention levels with lean-angle sensing, a cornering ABS system with rear-wheel lift mitigation, and the MV EAS 3.0 up-and-down quickshifter. Its equipment list also includes cruise control and launch control.
The standard RS 660 has an APRC system with a six-axis inertial platform, engine-map and engine-brake settings, traction and wheelie control, cornering ABS with rear-lift mitigation, launch control, cruise control and Aprilia Quick Shift. Its current standard technical sheet lists five riding modes.
Both therefore take electronically managed traction, braking and shifting seriously. The control strategies and menus are not established as identical, and counting modes is not a valid proxy for how well a system works. In particular, a disputed RS 660 Factory riding-mode claim has no place in an account of the standard Aprilia.
The practical point is that the RS 660's lower peak output does not make it a bare-bones motorcycle. Equally, the F3 RR's rider aids do not turn its extra peak power into an automatically easier or more forgiving machine. The electronics are part of each complete design.
What each bike is really answering
The MV Agusta F3 RR answers a question about how much performance and detailed hardware can be concentrated into a production three-cylinder sport bike. Its 147 hp, high-revving output, trellis frame, adjustable Marzocchi/Sachs suspension and named Stylema brakes all point towards that emphasis. The dedicated kit is another part of the model's story, but it remains outside the standard-road answer.
The Aprilia RS 660 answers a different question: how to make a modern fully faired middleweight with a 105 hp parallel twin, an aluminium frame, meaningful sporting hardware and a broad set of electronic controls. Aprilia's own language and its 2025 revision place the machine firmly in the sports middleweight category, not in a race-only role.
For a rider whose priority is the higher standard peak output and the F3 RR's particular triple-cylinder package, the MV offers that proposition. For a rider examining the smaller twin, standard Kayaba-equipped chassis and RS 660's approach to sporty road use, the Aprilia is an answer on different terms.
That is not a verdict about cost, ownership, reliability, comfort or which motorcycle anyone should buy. It is a comparison of design priorities. A reader seeking a track-day decision would still need relevant tyres, setup, circuit experience and preferably a properly controlled contemporary test rather than a simplistic power-number ranking.
Middleweight is a useful shelf label here, not a promise of mechanical equivalence. One machine uses a 798 cc triple and quotes 147 hp; the other uses a 659 cc twin and quotes 105 hp. Their chassis and electronics overlap in purpose but not in every detail. The point is not to force a winner out of that difference. It is to understand why both motorcycles belong in the conversation while answering different questions.
Read next on Superbike Vault
The MV Agusta F3 RR Model page owns the complete MY26 standard-road reference and the boundary around the dedicated performance kit. The Aprilia RS 660 Model page owns the detailed current standard twin-cylinder reference, separate from RS 660 Factory.
For the manufacturers' wider context, continue to the MV Agusta and Aprilia Brand pages. The existing MV Agusta Triples and Fours feature explores MV's broader engine-family story — a different question from this direct F3 RR versus RS 660 comparison.
Two fully faired Italian sport bikes. Two very different ways of making the middleweight label mean something.
