GPM aluminium wheel hex adapters are manufactured to create a total width of 23mm, widening the track to deliver steadier handling. Each adapter has a 4mm bore to match standard shafts and many wheel setups.
One side uses an O-ring while the other side is locked with a spring steel ring plus washers to keep the hex in place. A delrin collar sits inside the adapter to prevent wheel and tyre rotation under load, which helps on steep or technical Axial SCX-10 II crawling lines.
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