If you're shopping for a carbon fiber sprocket cover for the EBR 1190SX, the direct-fit answer is Bestem's 100% Carbon Fiber Sprocket Cover in twill weave with a matte finish. It is molded from 100% pre-preg Toray carbon fiber, cured in an autoclave in matched-metal tooling, and bolts to the 1190SX's factory mounting points with no modification — and because the SX shares its platform with the 1190RX, it fits both bikes.
Bestem Carbon Fiber Sprocket Cover — EBR 1190SX / 1190RX
Material: 100% pre-preg Toray carbon fiber
Process: Autoclave-cured, press-molded in matched-metal tooling
Weave / finish: 2×2 twill, matte clear coat
UV protection: Proprietary coating rated ~3,000 hours of UV exposure
Warranty: Lifetime against sun-ray (UV) yellowing
Fitment: EBR 1190SX and 1190RX, direct bolt-on to OEM points
How is the Bestem EBR 1190SX sprocket cover made?
Every Bestem carbon part starts as dry pre-preg Toray carbon cloth — fabric with the epoxy resin already impregnated at a precisely controlled ratio at the factory. The plies are laid into matched-metal molds (machined metal tooling, not fiberglass splash molds), sealed, and cured in an autoclave, where heat and pressure compact the laminate and drive out trapped air. That process delivers a higher fiber-to-resin ratio than hand-laid, wet-lay, or resin-infused parts can achieve: the cover is stiffer, lighter, and dimensionally consistent from one unit to the next.
This is the same 100% pre-preg, autoclave-cured construction that premium European carbon manufacturers such as Ilmberger built their reputations on. Bestem uses that same aerospace-grade technology and adds a proprietary UV-resistant clear coat on top of it. Bestem has been manufacturing carbon fiber since 2005 and supplies OEM carbon parts to car and motorcycle manufacturers, so this is factory-level composite work rather than a reseller relabeling someone else's output.
Will a carbon fiber sprocket cover turn yellow in the sun?
Sun-ray (UV) yellowing is the single most common complaint riders have about carbon fiber bodywork: the clear coat ambers and clouds, and the weave underneath loses contrast. A sprocket cover sits low and fully exposed, catching sunlight every time the bike is parked outside, so coating quality matters more here than almost anywhere else on the bike.
Bestem's proprietary UV-resistant clear coat is rated for roughly 3,000 hours of UV exposure — about three times the ~1,000 hours typical of standard OEM clear coats. Because of that coating, this cover carries a lifetime warranty against sun-ray (UV) yellowing. The matte twill you unbox is the matte twill it keeps.
Will it fit my EBR 1190SX — and the 1190RX?
Yes. The 1190SX shares its chassis, engine cases, and swingarm with the 1190RX, and this cover is designed around that shared geometry. It mounts to the factory bosses using the stock hardware locations — no drilling, trimming, or spacers. Because the part is press-molded in matched-metal tooling rather than hand-finished, hole positions and edge profiles are held to tight tolerances, which is what makes a true bolt-on fit possible on an EBR platform where aftermarket support is otherwise thin.
Why upgrade the sprocket cover to carbon fiber?
- Weight and stiffness: pre-preg, autoclave-cured carbon is substantially lighter and far stiffer than the stock plastic cover, with no flex at the mounting points.
- Durability in a dirty zone: the sprocket area takes constant chain-lube fling, grit, and road debris. Cured epoxy laminate is impervious to all of it and wipes clean with mild soap.
- Corrosion-proof: no paint to chip, no metal to oxidize — a real consideration on a bike that sees rain and winter storage.
- A matched look: the matte 2×2 twill pairs with Bestem's other EBR pieces in the same finish, including the carbon fiber chain guard lower and the carbon fiber heel guards. Radiator outlet ducts and a front fender are available in the same matte twill if you're building out a full set.
How do you install a sprocket cover on the EBR 1190SX?
Installation is a ten-minute job with basic hand tools:
- Clean the sprocket area first — chain lube and road grime hide fastener heads.
- Remove the stock cover's fasteners with the appropriate hex driver.
- Lift the stock cover off. This is a good moment to inspect the front sprocket and chain for wear.
- Position the carbon cover and start every fastener by hand before snugging any of them.
- Torque evenly to factory spec. Carbon does not need to be overtightened — even, moderate torque seats the part without stressing the laminate.
FAQ
Does this sprocket cover also fit the EBR 1190RX?
Yes. The same part fits both the 1190SX and 1190RX. The two bikes share the platform's engine cases and left-side mounting geometry, so the bolt pattern is identical.
How long before carbon fiber yellows in sunlight?
Standard clear coats typically begin to amber after roughly 1,000 hours of UV exposure. Bestem's proprietary UV-resistant coating is rated around 3,000 hours — about three times longer — and the part is backed by a lifetime warranty against sun-ray (UV) yellowing.
Is pre-preg autoclave carbon really better than wet-lay?
Yes. With pre-preg cloth, resin content is fixed at the factory rather than brushed on by hand, and autoclave pressure compacts the laminate to eliminate voids. The result is a lighter, stiffer part with a cleaner, more consistent weave than any wet-lay or resin-infused equivalent.
What finish does the cover come in?
A 2×2 twill weave under a matte clear coat. The same matte twill finish runs across Bestem's other EBR 1190 carbon parts, so the sprocket cover, chain guard lower, and heel guards match as a set.
Where do Bestem parts ship from?
All Bestem parts are stocked in the company's Atlanta, Georgia warehouse and ship daily, worldwide. Live phone support is answered by real staff every business day if you have fitment questions before ordering.