2021-on Aprilia RS660 Review: Speed, Key Features, Technical Specs, and Noted Issues

If only the high-octane buzz of a supersport or superbike will do, the RS 660 might feel lacking at first, but bear with it because it gets under your skin.

Its thrills are delivered in more subtle way and the excitement comes not from top speed or the ability to set lap records, but the exhilaration you get from sub 100mph acceleration and carrying momentum.

The way it clings to corners like its favourite comfort blanket is a trait is shares with its bigger RSV4 and Tuono sisters. Aprilia have always known how to make a bike handle and they’ve sprinkled the same magic on the RS 660.

Light, narrow and nimble it’s precise, balanced and steers with fingertip light precision. It never feels stiff or awkward, just easy, confidence inspiring, stable and flattering. The way the power is delivered never dominates the handling or stresses the rear tyre, which leaves you to just get on and enjoy the ride.

Suspension might not have Öhlins-like plushness and control (there’ll surely be a Factory version in the future), but its adjustable shock and Kayaba forks do their jobs perfectly over all kinds of road surface, fast or slow.

Brembos aren’t the latest and greatest, but they may as well be and have the kind feel, power and confidence that many top superbikes struggle to pull off. Pirelli Diablo Rosso Corsa IIs are just about the stickiest rubber you can fit this side of a trackday tyre, so there’s never a problem with grip either. Our long-term test bike did see the rear starting to square after around 1900 miles though.

• Related: Check out MCN's round up of the latest Sports tyres available here.

Now we’re coming to what makes the RS 660 so special: it’s riding position. How many times have you wished someone would just make a proper sportsbike that normal people can actually fit on? Well here it is.

The riding position takes its inspiration from the RSV4, but it’s a relief to find that its actually halfway between a superbike and sports tourer, so wrists, knees, back and neck don’t take a battering after a long ride.

The seat is comfy, pegs are low (ground clearance doesn’t suffer) and knees are nicely close together for extra control, thanks to the Aprilia being just two cylinders wide. Thighs fit snuggly beneath the sculpted tank wings and it’s not too much of a stoop to its raised clip-ons, which are set wide like a modern race bike’s to give you room to move around.

All practical stuff is taken care of, too, with mirrors that work, light controls, a screen that’s high enough to keep the wind off tall riders and a low seat height for those short in the leg.

How Aprilia have squeezed a lot into a very small space

It’s no accident the RS 660 is light and tightly packaged and it’s all been achieved without resorting to exotic materials. That’s harder to do when you’ve got to keep costs down than when you’ve got an open cheque book to produce a £90k Ducati Superleggera V4.

Aprilia have also turned the RS 660 around in a very short space of time with a mock-up only being shown at EICMA show at the end of 2018.

To keep the chassis simple its parallel twin motor is a stressed member of the ali beam frame with the swingarm bolted to the back. It isn’t just a happy convenience, the engine is half an RSV4, it’s so compact it can be easily be used and repackaged to power Aprilia’s new generation 660 models. 

Attention to lightness goes right down to its lithium battery, lightweight wheels (3.56kg front, 5.38kg rear) and a slimline subframe, which is 16mm narrower than the RSV4’s and weighs just 1.98kg, but strong enough to carry a pillion and luggage.

Even the numberplate holder gets the Weight Watchers treatment. It’s a one, instead of two-piece plastic item with a carbon fibre core and weighs just 210 grams.

Aprilia have managed to squeeze two chunky exhaust headers, a cat packed Euro5 collector box and silencer neatly under the engine for optimum weight distribution and low centre of gravity. It weighs just 6.2kg.

The first of a new generation of Aprilia electronics, the RS 660 uses a more powerful Marelli 11MP ECU, replacing the 7SM found in the RSV4 and Tuono. It controls everything from the ride-by-wire throttle, lean sensitive rider aids and even cornering headlights and self-cancelling indicators.

The RS660 has three standard riding modes (‘Commute’, ‘Dynamic’ and a customisable ‘Individual’), three engine maps, engine brake and cornering ABS settings, eight levels of traction control, wheelie control (which can be switched off), cruise control and an optional pitlane limiter and two more riding modes (Challenge and Time Attack).

At its heart lies a 99bhp, 659cc parallel twin-cylinder motor (there’s also A2-friendly 94bhp version) with a 270-degree crank. It’s essentially the front half of a V4 RSV4 1100 with the same 81mm bore and a longer 63.93mm stroke (up from 52.3mm).

It’s a perky little number with a sweet gearbox and light clutch but it’s tuned very much for life on the road. You’ll be seeing a lot of this engine over the coming months, as it will be powering the Tuono version and adventure styled Tuareg.

Power is delivered impeccably at town speeds and flows seamlessly to its 10,500rpm peak when you want to get a wriggle on. Tuck in for long enough it wouldn’t be hard to see over 140mph on the clock.

It punches out of corners with as little as 4000rpm showing on the tacho (where it makes 80% of its maximum torque) and things gets positively fruity past 6200rpm where it accelerates like a sportsbike should and the exhaust note flips from droning Moto3 to hard-edged, bass-infused V-twin.

Aprilia RS660 growler pic.twitter.com/qCBkQdOhSJ

— Michael Neeves (@Neevesy33) October 10, 2020

On the road you’ll never be dancing on the gear lever in search of power, because there’s plenty of it and being so light (just 183kg wet) it doesn’t need much to push it along anyway.

The RS 660’s crowning glory is its electronic rider aids, which along with its tasty chassis parts sets it apart from its lower-spec Japanese rivals.

The up/down quickshifter is as slick as they come and its cruise control is a godsend on motorways and for keeping to speed limits.

The new colour dash is bright, clear and easy to read and the switches easy to operate, but its huge left switchgear block is a bit of an eyesore and the high beam switch juts out so far, it’s easy to keep flicking it on by accident.

Rider modes, traction, wheelie and engine braking control are almost an irrelevance to an experienced rider on a bike with modest power, but it never hurts to have the ability to make things safer and more docile in dodgy conditions.

But for the less experienced an electronic safety net that works so smoothly, as they discover the joys of a sportsbike, is a no-brainer.

To find out more about Aprilia's 660 engine tech, click here.

Riding pre-production launch bikes, which were well finished, we did have a few starting problems and engine warning lights flashing, but Aprilia assure us they’re minor software glitches and will be sorted before full production begins.

Our first ride of a production version on UK roads didn't present us with any obvious problems, although tester Jon Urry does state that "there are a few areas that look budget on the RS 660".

If you head down to our Aprilia RS 660 owners' reviews you'll see several people have had problems with the engine and electrics. In particular, there seems to be a prevailing issue with oil leaks. Ensure any used bike you're looking at has had this investigated and sorted.

• Related: Check out MCN's round up of cleaning products.

We were hoping the RS 660 would be slightly cheaper, but when you look at its spec and performance you get a lot of sportsbike for the money.

Think if it this way: it’s less than half the price of an RSV4 1100 Factory and is arguably a better road bike. The Aprilia is considerably more expensive than its softer, lower-spec Japanese sportsbike rivals like the Honda CBR650R (£7949) and also the higher-powered traditional supersport Kawasaki ZX-6R (£9699). But it's considerably cheaper than the Yamaha R6 (£12,221) and MV Agusta F3 675 (around £14,000).

The similarly road-focused Ducati SuperSport 950 was freshly updated for 2021 and makes slightly more power than the Aprilia but costs £12,385 for the base model and almost £14,000 for the S.

However, the RS660's biggest rival in 2022 was the then-new Yamaha R7, which was far cheaper and aimed at exactly the same sort of riders. We're expecting more rivals to break cover in 2024.

Group test video: Aprilia RS660 vs Honda CBR650R vs MV Agusta F3 675

Many riders have turned away from sportsbikes because the current crop are just too focused, but the RS 660 could be the bike to change that. When you take into account the consequences of being caught speeding, the concentration required to ride litre bikes and the brutality of 200bhp, you can see why many have simply lost the love.

Even colleague Bruce, who races and has grown up on sportsbikes, freely admits that despite having access to a 2020 Fireblade this year he wasn’t tempted to take it out onroad due to its aggressive nature.

By building a middleweight bike that can be viewed as a proper sportsbike thanks to the quality of its electronics and chassis and then arming it with a motor producing more than enough power for road riding, Aprilia have given the RS 660 credibility that many middleweight rivals lack. There are a few compromises, most noticeably the shock, but overall it delivers a lovely balance of performance and handling that makes it fun. Owning an RS660 won’t feel like a downwards step.

You have chosen to own a smaller capacity sportsbike and you can hold your head up high at any bike meet. That motor, that gearing, that torque, those electronics and even the looks, it ticks every box and is an absolute blast to ride!

Having been available now for a couple of years a few examples are showing up second hand on the used market. There are mixed views and experiences regarding its reliability, check out the owners reviews to see a few people mention engine problems, leaks early signs of annoying niggles. Be diligent to check the service history and see fi any recalls have been fulfilled before purchasing. Take a look at the MCN classifieds to find yourself the right bike with the right history. Additionally, check out MCN's compare for the best quote to own and ride a Aprilia RS660.

The RS 660 comes with electronics galore: adjustable traction, wheelie and engine braking control, power maps, up/down quickshifter, cruise control, riding modes and a multi-function colour dash (with fuel gauge).

You also get Pirelli Diablo Rosso Corsa II tyres, adjustable Kayaba forks, Brembo calipers and cornering LED headlights (dipped beam comes on automatically in low light), LED daytime running lights and self-cancelling indicators.

Just like its flagship models Aprilia have produced a full range of performance, touring and cosmetic accessories, from a full Akrapovic exhaust system, single seat cowl, software to activate a pitlane limiter and the electronics for a race pattern shift, billet ali levers, carbon number plate holder and wheel stickers.

Sculpted bodywork has built-in RSV4-like wings that look the part, but they’re not exactly needed at road speeds, but the double-skinned fairing helps to keep the RS 660 cool to make life more comfortable for the rider in the heat. It also comes in three funky satin paint jobs: a black one with bright red wheels, a Cadbury’s blue and gloss red one and an ‘acid gold’ one.

A lazy fairing lip

The RS 660 is a lovely looking thing, but it’s let down by a lazy design feature on the nose fairing. In order to accommodate the unnecessarily bulky left switchgear, the Noale firm have added a lip in the body work, to insure a full turning circle. On our long-term test bike we noticed it after around 50 miles and now see it every time it’s parked. A little more R&D for symmetry would’ve gone a long way.

Aprilia RS 660 aftermarket upgrades

Our long-term test bike was also fitted with a number of aftermarket accessories over 2021 - providing additional crash protection, improving the looks, and experimenting with different tyres. You can find our thoughts on each of them below.

R&G Brake Lever Guard

An easy-peasy modification to instal and vitally important to any rider wanting to venture on track, with many circuits now stipulating mandatory brake lever guards on any bike. The R&G unit is built well, hasn’t faded and continues to hold strong where the bar end once sat. The black design also means it blends into the looks, which is handy as I have a real disliking for lever and clutch guards on road bikes.

R&G Engine Case Covers, 

Much like the brake lever guard, the case protection’s black finish slips seamlessly into the factory finish of the bike. I’m seriously impressed and although not installed as a mandatory measure, it gives you added peace of mind, should the worst happen. Buying them separately also saves on the price of replacements, too.

R&G Cotton Reels

Being a sportsbike, there’s no centre stand – meaning these R&G reels are vital for popping the RS onto a paddock stand. After plenty of use, they remain firmly in place, with no signs of wearing out and they’re a decent size to make locating the paddock stand easy. These are important when it comes to chain maintenance too, with the correct tension in the manual logged with the rear raised in the air.

Evotech Performance Tail Tidy

Once installed it tidies up the compact back end nicely, but we could live without it. The unit itself is really nicely built and the planet-friendly packaging contains no plastics. That said, the photo instructions found online can be hard to follow and do miss the removal of one bolt. Having such a small arse it’s also easier to remove all the RS’ plastics from the rear end when attempting to reattach everything and stuff in all the electronics. Factor this into your assembly time.

Bridgestone Battlax S22 tyres

Having used OE Bridgestone S22s on multiple bikes, they've always been impressive. They inspire confidence in low temperatures and are a great road-going performance tyre. Unfortunately, they’re just not quite as good as the standard-fitment Pirelli Rosso Corsa 2s, which offer more front-end feel, greater confidence under braking, and allow the bike to drop in faster and accelerate out of a bend with greater stability. They’ve also squared at the rear after 3000 miles.

Aprilia Tank Pad

On the face of it, getting all the individual blobs to line up on the tank looks hard, but it couldn’t be easier thanks to the simple-to-follow instructions and sticky back plastic packaging. It’s great value and suits the bike nicely. I just wish it was a solid unit, as the finish around the rear of the tank is thin and prone to scratching – meaning some areas are still exposed to damage.

Aprilia RS 660 Extrema

In 2022 Aprilia revealed a lighter, carbon equipped version of the RS660 sportsbike with a claimed kerb weight of just 166kg.

Called the RS660 Extrema, the Noale firm have shed the extra pounds via an all new, street-legal exhaust system by Italian specialists SC Project.

Also helping the bike reach an impressive claimed 100bhp, it features a carbon silencer positioned on the righthand side, a change from the twin-exit under engine design of the RS.

The silencer is held by a black anodised aluminium bracket, which allows the removal of the passenger foot pegs and thus more weight saving.