The bike is doing fine with just an on/off switch. I'm running the 24v 600watt Currie motor with a 24v sla and a 6v nimh battery for 30v. I mention the nimh as a separate battery because it makes the power surge different. More mello is the only way I can describe the difference. With Sla when you hit the on switch the bike jump like crazy. With the nimh in the circuit it just eases into the power curve. I know it sounds ridiculous but that is what happens.
Anyway it does fine. On most of the hills here the bike runs fast enough that I can't catch the freewheel. I should put a larger chain ring on the bike so that I can help more, but I just haven't felt the need just yet.