Hello. Mine is a 2018 Biktrix Stunner Step Over*, with the 750 watt mid drive, the 5 speed Sturmey Archer, and the big battery. My wife's is a 2018 Evelo Aurora Step Thru, 750 watt mid drive, with the "big" battery, and the Envioli auto trans. Both are cadence sensing, and both have ~2K miles...