It's just the standard single speed.

Just got a brand new radrunner and I'm running into this issue. The chain slips when under high tension. For ex. When stopped and trying to climb a hill (with no PAS or Throttle) the crank will slip just about every pedal stroke or so. Once I'm moving or not applying as much pressure then it won't slip. Can't figure out how to correct this.
Thanks in advance.