There are currently two gear ratios available for Mini 4WD racers to use on their MS chassis machines, 4:1 and 3.5:1. This means that for a particular circuit sometimes the former may be too slow while the latter may be too fast. To solve this situation and give racers another option, this new set offers a 3.7:1 ratio gear set.
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- SKU: HRPDS16532
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