20cm/7.87inch

Note: This set does not include tires and needs to be purchased by the customer. The suitable tire size is 29*2.5-3.0inch Description If You Are in Pursuit of Speed and Excitement, You Will Be Annoyed by the Difficulty of Climbing a Mountain by Bicycle! Then You Can Try This Electric Bicycle Motor Conversion Kit to Get Your High-power Electric Bicycle. This Professional and Reliable Conversion Kit Is the Ideal Choice for You to Become a Runner Who Is Chasing the Wind. Key Features Premium Material: the Motor Wheel and Rim of This Conversion Kit Is Made of Aluminum with Good Performance, Which Is Sturdy, Durable, and Not Easy to Rust. Budget-friendly Design: the Package of This Kit Includes All the Items Required, Such As Handlebars, Controller Bags, Etc., so You Don't Need to.