HPI RS4 Sport 3 75 Tooth Spur Gear. This gear will fit the standard RS4 Sport 3 Flux but can only be used with a pinion between 23 and 32 Teeth.
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![HPI-113705 HPI Spur Gear (75T) [113705] HPI](http://ultimatehobbies.com.au/cdn/shop/files/HPI-113705.jpg?v=1758059778&width=500)