![Ventana used a wishbone seat stay on the El Martillo CX. The seatpost is ø27.2mm, but customers can order any size they like for a fee. Hope Crockell's Junior 13-14 Ventana El Martillo CX, 2018 Cyclocross National Championships. © C. Lee / Cyclocross Magazine](https://www.cxmagazine.com/wp-content/uploads/2018/03/2018-nationals-ventana-junior-15-16-DSC_0725-cxmagazine-clee-750x531.jpg)
Ventana used a wishbone seat stay on the El Martillo CX. The seatpost is ø27.2mm, but customers can order any size they like for a fee. Hope Crockell’s Junior 13-14 Ventana El Martillo CX, 2018 Cyclocross National Championships. © C. Lee / Cyclocross Magazine