FM-A vs AR Chassis: Choosing Between Front and Rear Motor Layouts
Choose a layout and maintenance approach, then budget for the exact kit and compatible parts. A front motor alone does not guarantee better landings.
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Browse available alternativesCosmosonic is driven by Retsu Seiba in "Let's & Go!! Return Racers!!" and takes visual cues from earlier cars in the Sonic lineup, with an aerodynamically sculpted, predominantly red body (via the included metallic stickers) and a distinctive rear wing.
It sits on the black-molded FM-A chassis, sharing the range's front-motor layout, low-friction front skid bar, four rollers including 8mm-thick rear rollers, and aero side stays for Grade-Up parts. Yellow A-spoke wheels are fitted with small-diameter low-profile tires, and the gear ratio is 3.5:1.
Choose a layout and maintenance approach, then budget for the exact kit and compatible parts. A front motor alone does not guarantee better landings.
Choose a Mini 4WD FM-A chassis kit with front-motor handling in mind. Confirm the body, parts fitment and event rules before planning a setup.
The Mini 4WD FMA chassis puts the motor up front, which changes braking and jump attitude completely. Tuning around that forward weight bias.