Razor replacement chain tensioner for the Razor e200 Electric Scooter (Version 36+). *Razor Electric Scooter versions can be determined by locating your bar code ID on the battery cover and/or on the bottom of the scooter frame. The 7th and 8th digit in the series (the two numbers between the dashes) will tell you the version of your product: 01=version 1; 02=version 2; 09=version 9, and so on. For example: if your bar code id is 103050-13-10030196908, then the product version is 13. Please be sure you identify your version before placing an orde