K I bit the bullet & held on for 15 mins to talk to someone. I'm on Boeing 737 - 800 and 737 - 900 planes.
Allowed 277cm/ 9 foot and the lady said, 30kg luggage plus 15kg surfboard. Which sounds very generous, but they are Indo. Could be a mix up, website does say 2 items of luggage and I reckon more likely total of 30kg...
Seems like a nice option to Garuda anyway, 15kg/9 foot is heaps for at least a couple of boards