Kyosho IF422B Rear Hub Carrier Inferno MP9

This is the rear hub carrier for Kyosho's Inferno MP9 platform.

The rear hub carrier holds the rear wheel hub and bearings and connects them to the suspension arms. It is where rear toe-in is set, and rear toe is one of the settings that most directly controls how stable the car feels on power. More toe-in makes the rear end plant and track straight under acceleration; less frees it up and lets the car rotate more willingly. Because that geometry is built into the part, the carrier you fit is a setup decision as much as a repair.

Structurally it takes everything the rear wheel receives, which on a 1/8 buggy means every landing and every impact with a rut or a pipe. A cracked carrier changes rear geometry on that side only, so the car pulls under power and behaves differently through left and right corners.

The B designation is Kyosho's revision suffix, superseding the original IF422 rather than indicating a hardness grade. A separate hard compound version exists under its own number. Fitment covers the MP9 and all its TKI variants, MP9e and MP9e Evo. V2, and Inferno GT3.