Compatible with Dualtron Achilleus, Achilleus New, City, City New, Thunder, Thunder 2 New, Thunder 3, Ultra, Ultra 2, Ultra 2 UP, and Ultra 2 Upgrade, this spring is fitted over the motor cable at the point where it enters the motor, helping protect the cable from bending and wear. Please select your scooter model before adding to cart. Available in two sizes: 65mm diameter for thinner wire (Mini, Eagle, Victor, New, 3) and 75mm diameter for thicker wire (Thunder, Ultra). Includes 1× spring.