Mini 4WD Setting Gear Set: AR (15456) vs FM-A (15516)
Tamiya 15456 and 15516 bundle five gear ratios, 3.5:1 to 5:1, but fit different chassis. Compare contents, price and fit before buying the wrong set.
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Browse available alternativesScrew Set B is a hardware pack focused on specific screw lengths for chassis assembly and tuning. It includes six each of 10mm, 12mm and 15mm screws, plus four 2mm nuts and two lock nuts, covering the more common lengths needed when building up stays, rollers and other add-on parts.
Like other fastener packs in the Grade-Up range, it's compatible with essentially every Mini 4WD chassis Tamiya has released, from the Type 3 through current platforms, since screws and nuts aren't chassis-specific parts. It complements Screw Set A (No.232): where Set A is described as a general-purpose assortment for whatever comes up, Set B gives a fixed, known quantity of the three lengths racers use most for stay and roller mounting, useful for planning a specific build rather than restocking a spares box.
Tamiya 15456 and 15516 bundle five gear ratios, 3.5:1 to 5:1, but fit different chassis. Compare contents, price and fit before buying the wrong set.
Choose a Tamiya Mini 4WD gear set by the exact chassis, motor layout and instructions. Check ratio, gear cover and event rules before changing the drivetrain.
Racing Mini 4WD turned 40 in 2026. What Tamiya actually released for it: the Zenperor 3 body special, the Dash-1 Emperor Type 3, and two anniversary motors.