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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

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