Some treadmill running belts may get a line of wear on one or both sides. First check to see it there is anything under the motor cover or under the tread that may be causing the wear.
Note: This also may be from users standing on the side rails with their heels dragging on the running belt while its moving which does not take long to wear a line.
See Treadmill Running Belt Details for more details on troubleshooting running belt wear
Note: This also may be from users standing on the side rails with their heels dragging on the running belt while its moving which does not take long to wear a line.
See Treadmill Running Belt Details for more details on troubleshooting running belt wear