Replacement integrated saddle and seatpost for Rothan. "Scoop shaped" saddle is different to a pedal cycle saddle and better supports the child while they scoot, preventing them from pushing themselves off the front of the saddle. 25.4mm diameter. Seatpost is 160mm long, which is the length that was supplied as standard with a Rothan 12 or Rothan 14. Choose if your child is at the bottom of the growth range on the bike. If your child needs the saddle to go higher than the current seatpost will allow, choose the 240mm version instead.