Distance: 603 km (374 miles) loop from Chiang Mai. Five days. Altitude: around 1,450 m (4,757 ft) at the Doi Kiew Lom ridge Best for: continuous corners, multi-day touring, small-capacity bikes Best time: November to February Technicality: Moderate. Low speed, high frequency. Second and third gear for days. Golden section: Pai to Soppong on the 1095, 54 km (34 miles)