Mini 4WD Brake Sponge Hardness and Stay Angle
Mini 4WD brake sponge hardness and stay angle are two separate settings. Compare friction grade against mounting angle so the car slows safely and consistently.
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A sponge tire set formulated for low rebound, meaning the tire absorbs landing energy rather than bouncing the car back up off the track surface after a jump. The low-density sponge also keeps the tires light. They are sized for large-diameter narrow wheels rather than Tamiya's standard-width tires.
The "HG" (High Grade) designation marks this as an upgraded sponge compound rather than the tires bundled with Tamiya's kits, and low-rebound sponge is generally favoured on tracks with big jump sections, where a normal tire's bounce can throw a car off-line or send it over a barrier on landing. Large-diameter narrow wheels are the type fitted to many of Tamiya's Aero and Fully Cowled Mini 4WD releases; the taller diameter changes a car's effective gearing and ground clearance compared with the standard wide wheel and tire combination, so this tire size isn't interchangeable with a standard wheel.
Mini 4WD brake sponge hardness and stay angle are two separate settings. Compare friction grade against mounting angle so the car slows safely and consistently.
A Mini 4WD wheels guide covering large, small and narrow options, how diameter changes effective gearing, and getting a true, wobble-free fit.