Upright leisure riding Shimano Steps E6100 is lighter and more affordable than similar city systems from Brose or Bosch, and the performance is no slouch compared to the most common 20mph city oriented motor, the Bosch Active line. Like Bosch, they use a proprietary battery along with their motors. Batteries for City systems are externally mounted on the back rack or frame mounted on the downtube, and come in a 418 watt hour and 504 watt hour versions.. Overall the system is less bulky and lighter - and price ranges of 2-3k they lead the industry for value in a mid drive.
Shimano's new street motor system is almost 1/2 a pound lighter than the 6000 series, and 20% more efficient - so you can expect up to a 50 mile range from the 418 watt hour battery, and up to 70 from the 500 watt hour battery. They have narrowed the width of the motor (q factor) for better cornering clearance, and made it even quieter than the original. Delivers an output torque of 60Nm for solid climbing and quick acceleration, with an advanced sensor for smooth starts and stops that is easier on the drivetrain. Also improved is that now the motor gives 70% of added force (from your pedal input) in the eco assist mode vs 50% in eco on the E6000. Also changed is higher cadence support so if you pedal up to 120 rpm, the motor will still assist, vs the older motor dropped out at around 100 rpms.
The display have been updated so you can connect via bluetooth and the e-tube app, in fact you can replace the display with your phone if you prefer that.