R0190 - REAR WHEEL PLATE CARBON GRAPHITE (aerodisk) 2pcs

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R0344 - SS 1st GEAR HOUSING (IF18-2)

The new SS version is more durable than previous gear housings due to a review of the manufacturing process, including the shape and materials used.
As the name "SS => Strong Support" suggests, the spur gear support is increased, minimizing the chance of stripping gears.