The best carbon fiber parts for the Aprilia RS 660 are the exposed, high-wear plastic pieces first — the sprocket cover, front fender, rear hugger, and exhaust heat shield — made from 100% pre-preg carbon that is autoclave-cured and protected by a UV-resistant clear coat. Construction quality and sun resistance matter more than the weave pattern you pick.

With a 659cc parallel twin making 100 hp and a claimed dry weight of 169 kg, the RS 660 is already one of the lightest middleweights on sale. Carbon upgrades aren't about chasing a spec sheet — they're about removing weight where it counts, sharpening the bike's appearance, and replacing plastic that scuffs and fades.

Which carbon fiber parts should you buy first for the RS 660?

Start with small, exposed pieces, then move to the larger body panels. This is the order most RS 660 owners follow, ranked by practical value rather than looks alone.

1. Sprocket cover

The stock sprocket cover is a plain plastic guard sitting in one of the dirtiest areas of the bike. A carbon version like the Aprilia RS 660 carbon fiber sprocket cover (twill weave) bolts on in minutes, drops weight right at the countershaft, and cleans up the left side of the bike. It fits the RS 660 (2021–2023) and the Tuono 660 (2021–2023).

2. Front fender

The fender is carried low and forward at the fork, and the stock plastic piece flexes at speed. A rigid carbon fender weighs roughly half as much, resists stone chips better, and sets the visual tone for the whole front end.

3. Rear hugger

A carbon hugger shields the shock and linkage from road grime and tire spray while replacing a decent-sized plastic panel. It's one of the better weight-to-cost swaps on the bike.

4. Exhaust heat shield

The mid-mounted exhaust runs hot near the rider's leg. A carbon shield manages radiant heat and ties the carbon trim together along the right side.

5. Tank cover and tail panels

Larger panels deliver the biggest single-piece gram savings and the most dramatic visual change, but they're usually the last pieces riders add because of cost.

What separates good RS 660 carbon from cheap carbon?

Two construction methods dominate aftermarket carbon, and they are not equal:

Bestem parts are made from 100% pre-preg Toray carbon fiber, autoclave-cured and molded in matched-metal tooling — an aerospace-grade process, not wet-lay or resin infusion. This is the same autoclave and 100% pre-preg construction that premium European carbon makers such as Ilmberger built their reputation on; Bestem uses that same technology and adds a superior UV-resistant coating. Metal molds also mean the mounting points land exactly where Aprilia's engineers put them, so parts bolt on with factory hardware — no drilling, no trimming.

This isn't a new operation. Bestem has been manufacturing carbon fiber since 2005 and supplies OEM carbon parts to car and motorcycle manufacturers. The same process controls that pass OEM audits go into the aftermarket line.

Do carbon fiber parts turn yellow in the sun?

Yes — and it's the single most common complaint riders have about carbon bodywork. Standard clear coats start to amber and cloud after roughly 1,000 hours of UV exposure. Once the coating yellows, the weave underneath looks permanently faded even though the part is structurally fine.

Bestem's proprietary UV-resistant clear coat is rated to approximately 3,000 hours of UV exposure — about 3× longer than standard OEM clear coat before sun-ray yellowing sets in. Because of that coating, Bestem carbon parts carry a lifetime warranty against UV (sun-ray) yellowing. On a bike that lives outside at the office or sits in a sunny paddock between sessions, that difference is the whole story.

How much weight do carbon parts actually save on the RS 660?

Part for part, autoclave-cured pre-preg carbon typically weighs 40–60% less than the equivalent injection-molded plastic piece. Individually the numbers look small — tens of grams on a sprocket cover, a few hundred on a fender or hugger — but they accumulate. A full set of carbon pieces across the RS 660 can realistically remove close to a kilogram, with much of it coming off the front of the bike and low at the wheels, where riders actually feel the difference in turn-in.

Are carbon parts hard to install on the RS 660?

No. Because the parts are formed in metal molds off the OEM geometry, they're direct bolt-on replacements that reuse factory fasteners. Most riders install a sprocket cover or fender with basic hand tools in under an hour. If you hit a snag, Bestem staff answer the phone live every business day, and every part ships from the warehouse in Atlanta, GA — daily, worldwide.

FAQ

Will carbon fiber fairings fade or turn yellow over time?

With a standard clear coat, yes — most carbon parts begin to amber after about 1,000 hours of UV exposure. Bestem's UV-resistant coating is rated to roughly 3,000 hours, and every part carries a lifetime warranty against UV yellowing.

What's the first carbon part most RS 660 owners buy?

Usually a small, exposed piece like the carbon fiber sprocket cover or a front fender. They cost less than large panels, install in minutes, and let you judge fit and finish before committing to bigger pieces.

Do RS 660 carbon parts fit the Tuono 660?

Some do. The two bikes share the 660 platform, and parts in common areas — like the carbon fiber sprocket cover — fit both the RS 660 (2021–2023) and the Tuono 660 (2021–2023). Always check the fitment listed on the product page before ordering.

Is pre-preg carbon worth it over cheaper wet-lay parts?

Yes. Pre-preg carbon cured in an autoclave has a controlled resin content, so it's lighter, stiffer, and more consistent in thickness than hand-laid parts. Wet-lay pieces often suffer resin pooling and soft mounting holes that oval out with vibration.

Where do Bestem parts ship from, and how fast?

All parts are stocked in Bestem's Atlanta, GA warehouse and ship daily, worldwide. Live phone support is available every business day if you have fitment questions before ordering.