This depends on the type of battery you select. Based on a rider weiging 75kg and cycling on smooth flat terrain with minimal stops/starts, the following guide is what you should expect from most ebike systems (please note most manufacturers exaggerate the milage, so it’s best to focus on comparing the battery spec instead of comparing the milage figure. Most experts agree that the following battery spec would roughly yield the following milage on an ebike); 36V/9Ah battery 25-30 miles, 36V/11Ah battery 30-35 miles, 36V/15Ah battery 40-45 miles. 36V/17Ah battery 45-50 miles. These will vary slightly depending on the level of assistance given by the motor and the use of a throttle.