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Continue to ChatGX125 Piston - PBC621XL - https://www.electricbikeusa.net/gio-bike-parts-master-catalogue/gx125-piston-pbc621xl
GX125 Piston - PBC621XL - https://www.electricbikeusa.net/gio-bike-parts-master-catalogue/gx125-piston-pbc621xl