??Perfect refit accessories for your bike!<br> <br> Features:<br> Mainly made of durable steel.<br> 12 teeth design.<br> Inner diameter: 18MM and 34MM.<br> <br> Specifications:<br> Material: Steel<br> Inner diameter: 18mm£¬ 34mm<br> Outer teeth diameter: 53mm<br> Thickness: 26mm<br> Weight: 116g / 4.1oz<br> <br> Package List:<br> 1 * 12T Single Speed Flywheel<br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>  <br>