‎14.17 Inches

Make sure this fits by entering your model number.
【39.4″ X 14″ COMPACT RUNNING BELT】 The compact running belt is large enough for most people and is especially suitable for smaller people. The five-layer running belt is anti-slip and shock absorbent.
【MULTI-FUNCTION LCD SCREEN AND PHONE HOLDER】 Multi-function LCD screen with heart rate, speed, distance, time and calories. Heart rate can be tested by placing both hands in the measurement area of the armrests. The phone can be placed on the phone holder while exercising on the treadmill.