The Bestem carbon fiber sprocket cover fairing for the 2015-2019 BMW S1000RR is a direct bolt-on replacement for the stock plastic cover, built from 100% pre-preg Toray carbon fiber in a 2×2 twill weave and autoclave-cured in matched-metal molds. It mounts to the factory points over the front (countershaft) sprocket with no drilling or trimming, cutting weight and giving the left side of the bike a clean, race-paddock finish.
What years of BMW S1000RR does this sprocket cover fit?
This cover is molded specifically for the 2015, 2016, 2017, 2018, and 2019 BMW S1000RR — the K46 generation, which introduced the symmetric headlight bodywork for 2015 and ran through 2019. Because it is formed in matched-metal tooling from the factory part's geometry, it follows the K46's mounting points and contours exactly. The redesigned 2020-and-newer K67 uses different bodywork, so K67 owners should choose parts engineered for that generation instead.
How is the Bestem sprocket cover made?
Construction is where this part separates itself from typical aftermarket carbon:
- 100% pre-preg Toray carbon fiber — the resin is pre-impregnated into the fiber at a controlled ratio, so there is no excess resin pooling and no dry spots. This is not wet-lay, hand-laid, or resin-infused carbon.
- Autoclave-cured — the part is cured under heat and pressure, which compacts the laminate, eliminates voids, and produces a stiffer, lighter piece than oven-cured or vacuum-bagged alternatives.
- Metal-molded (matched-metal tooling) — both faces of the part are formed against metal molds, giving a crisp, consistent surface and uniform thickness, part after part.
This is the same aerospace-grade, 100% pre-preg autoclave construction that premium European carbon specialists such as Ilmberger built their reputations on. Bestem uses that same technology and adds a superior UV-resistant coating on top of it — which matters more than most riders realize, as the next section explains.
Do carbon fiber fairings turn yellow in the sun?
Yes — sun-ray (UV) yellowing is the single most common defect riders see on carbon fiber parts. A standard clear coat begins to amber and cloud after roughly 1,000 hours of UV exposure, and the weave underneath loses its depth with it. This is the failure mode that gives cheap carbon its bad reputation, and it is the problem Bestem engineered its coating to solve.
Bestem's proprietary UV-resistant clear coat is rated to approximately 3,000 hours of UV resistance — about three times longer than standard or OEM carbon coating before sun-ray yellowing appears. Because of that coating, this sprocket cover carries a lifetime warranty against sun-ray (UV) yellowing. On a part that sits low on the left side of the bike in full sun, that protection is the difference between a cover that still looks deep and glossy years from now and one that ambers within a couple of seasons.
Why replace the OEM sprocket cover with carbon fiber?
- Weight reduction: pre-preg carbon carries a lower resin content and a far better stiffness-to-weight ratio than the injection-molded plastic original, so the carbon cover is noticeably lighter while doing the same job of shielding the countershaft area from chain fling and debris.
- Matched aesthetics: the 2×2 twill weave under a deep-gloss clear coat matches other Bestem twill parts for the K46, such as the 2015-2019 S1000RR carbon fiber seat cover fairing, so you can build a consistent look piece by piece.
- Durability in a dirty zone: the front sprocket area collects chain lube and grit. The hard UV clear coat wipes clean easily and resists the hazing and staining that age plastic covers.
- Consistent quality: Bestem has been manufacturing carbon fiber since 2005 and supplies OEM carbon parts to car and motorcycle manufacturers — the same process discipline behind those OEM programs goes into this cover.
How do you install the sprocket cover on a 2015-2019 S1000RR?
Installation is a straightforward bolt-on. Remove the stock fasteners holding the OEM plastic cover, lift it away from the countershaft area, set the carbon cover in place, and reinstall the hardware through the factory mounting points. Basic hand tools, a few minutes of work, no drilling, trimming, or adhesive. Because the part is formed in matched-metal molds from the factory geometry, the holes and edges line up without persuasion.
Quick spec summary
Fitment: BMW S1000RR 2015-2019 (K46)
Material: 100% pre-preg Toray carbon fiber
Weave: 2×2 twill
Process: autoclave-cured, matched-metal molds
Finish: high-gloss UV-resistant clear coat (~3,000-hour UV rating vs ~1,000 hours standard)
Warranty: lifetime against sun-ray (UV) yellowing
The BMW 2015-2019 S1000RR carbon fiber sprocket cover fairing in twill weave is in stock at Bestem's Atlanta, GA warehouse and ships daily, worldwide. Live phone support is available every business day if you have a fitment question before you order — customer satisfaction is the top business priority, and it shows in how the parts are made and supported.
FAQ
Does this sprocket cover fit the 2020 or newer BMW S1000RR?
No. This cover (SKU CBBM-S1K15-SPC-T) is molded for the 2015-2019 K46-generation S1000RR. The 2020-onward K67 is a redesigned bike and needs its own parts — Bestem stocks K67 carbon such as the 2020+ S1000RR carbon fiber rear hugger with chain guard.
Will the carbon fiber sprocket cover turn yellow over time?
Standard carbon clear coats begin to amber after roughly 1,000 hours of UV exposure. Bestem's proprietary UV-resistant coating is rated to about 3,000 hours — roughly three times longer — and the part is backed by a lifetime warranty against sun-ray (UV) yellowing.
Is installation really bolt-on, or does the cover need modification?
It is a true bolt-on. The cover uses the factory mounting points, needs only basic hand tools, and requires no drilling, trimming, or adhesive. Most riders complete the swap in a few minutes.
What weave and finish does the cover have?
A 2×2 twill weave under a high-gloss, UV-resistant clear coat. It matches the weave and finish of other Bestem twill parts for the same bike, including the
Pre-preg autoclave construction, direct OEM bolt-on fit, shipped from the USA.Shop Bestem Carbon Fiber