GPMs aluminium wheel hex adapters provide a fixed 23mm width to increase track stability and improve low speed balance. The adapters accept a 4mm axle shaft to match many crawler wheel setups.
The design combines an O-ring on one side with a spring steel ring and washers on the other to maintain a firm seating. A delrin collar fitted inside the hex prevents wheel and tyre rotation, giving better traction on rough Axial SCX-10 II sections.
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