Koswork Kyosho Ultima & JJ Carbon Rear Stiffener RC Gearbox Brace - KOS04361-18

The Koswork KOS04361-18 is a carbon fibre rear stiffener and gearbox brace designed for the Kyosho Ultima and Kyosho JJ 2WD off-road buggies. Cut from carbon fibre plate, this brace reinforces the rear of the chassis, reducing flex around the gearbox area — a known weak point on older Kyosho buggy platforms. If you're running an Ultima or JJ competitively or want to tighten up the rear end of your build, this is a direct-fit solution from Koswork, a brand focused on precision aftermarket parts for vintage and classic RC buggies.

Key Features

• Carbon fibre construction provides a rigid, lightweight brace compared to standard plastic components
• Reinforces the gearbox mounting area at the rear of the chassis to reduce unwanted flex
• Direct-fit design for the Kyosho Ultima and Kyosho JJ — no modification required
• Black carbon finish gives a clean, purposeful look in keeping with competition buggy builds
• Part number KOS04361-18 for straightforward reordering and compatibility verification

Compatible With

• Kyosho Ultima
• Kyosho JJ

What's Included

• 1x Koswork KOS04361-18 carbon fibre rear stiffener / gearbox brace