Thanks PedalUma, I appreciate you taking the time to help me figure this out. I'll go with the standard 42T and consider an upgrade in the future. So you are suggesting a 36V 350W unit will be fine for my intended use and be the most efficient. I'm kind of confused as the Elecycle site only states 250-750W it does not allow me to choose the wattage of the motor. Also, I like the idea of the small display but don't think it would work well with the Ergo handle bars I have on the bike. Looks like the larger display is my only choice.