Source google image: https://ae01.alicdn.com/kf/HTB1cHG3JFXXXXX0XFXXq6xXFXXXS/-font-b-25-4mm-b-font-27-2-alloy-MTB-seat-tube-Road-Track-bicycle.jpg

Tige selle 25.4
Source google image: https://ae01.alicdn.com/kf/HTB1cHG3JFXXXXX0XFXXq6xXFXXXS/-font-b-25-4mm-b-font-27-2-alloy-MTB-seat-tube-Road-Track-bicycle.jpg