Polini Kevlar Variator Belt. Low friction Polini variator belt, featuring aramid fibre inlay, making it extremely robust. It`s no coincidence that this belt is Polini`s first choice for the race track. Additional grip means that cold-slip is minimised. This belt is at home on the track, but is also a great upgrade for a standard engine that is being put through its paces. Dimensions: 683-18.2-30