Malossi RC one piaggio derbi gp1 typhoon gear set
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Malossi rc one spec/ratio primary and secondary gear set for your piaggio typhoon, Derbi GP1, or rc one/c one motor.
14/39 primary kit
13/48 secondary.
this is the combo to get your bike into the 90-100mph range with proper tuning.
this is a kit with BOTH primary and secondary kits.