Tough HC jungle climb, full segment is 18.5km and gains 940m, great surface with a few brutal surface, can be done as an out and back from chiang mai or passes into Lampang where you can loop back around Kew Fin for a brutal day out. Not much in the way of food or water on the way up until you get down the other side where there is a small town Ban Mae Chaem has coffee shop/street shop etc.