It is said that there is increasing interest from tourists every year for the wooden wheel competition. or Hmong Formula On Doi Mon Cham, Chiang Mai Province, from the wooden carts that Hmong brothers and sisters in the north used to transport firewood along the high mountains. To local sports and step into the exciting Hmong Formula competition. It has become a tourist attraction and another soft power on high mountains. .-Thai News Agency Source: Thai News Agency