Upgrade the riding experience of the SYM Symphony 125 ST with the Polini Hi-Speed transmission system. Designed specifically for modern Euro 5 and Euro 5+ specification engines, this variator is the ideal solution for anyone after more liveliness and immediate response from their scooter. The Hi-Speed improves acceleration and roll-on strikingly, letting the engine deliver the maximum it is capable of without being strained. Polini's top-class build quality guarantees smooth running and greater durability in hard daily use around town.