2013 Ktm 350 SX-F, 250 Handling - 450 Power! - The KTM 350 SX-F employs a steel-trellis main frame which provides favorable chassis flex characteristics. Although the shock body and spring (5.8 kg/mm) is the same it has updated the valves and functions in a linkage with lighter fasteners. Each wheel is shod with commercially available Dunlop Geomax MX51 tires in sizes 80/100-21 front and 110/90-19 rear. The throttle position sensor was also made to be more durable and the idle adjustment and high idle, cold start functions are no longer on the same knob.