Derbi GPR 125 4T max speed per gear
I'm sure someone out there will find this mildly interesting, I'd like to know how it compares to the Aprilia RS4 125 (the 4 stroke) Stock gearing for the Derbi GPR (14 tooth front /49 tooth rear)

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Derbi GPR 125 4T(Giannelli Ipersport NO DBKILLER) w/KTM Duke 125 Akrapovic Exhaust [1080p 60 fps]

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