HPI RS4 Sport 3 66 Tooth Spur Gear. This gear will fit the standard RS4 Sport 3 Flux but can only be used with a pinion between 31 and 37 Teeth.
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![HPI-113706 HPI Spur Gear (66T) [113706] HPI](http://ultimatehobbies.com.au/cdn/shop/files/HPI-113706.png?v=1758059777&width=520)