I changed my front tire to a thin one and noticed a wobble (about 4x per second) at any speed when my hands aren't on the handle bar. I can even notice something was off when my hand was on the handle bar. Seems to be related to how rear heavy my electric bicycle is compared to the front. The front tire came from a road bike and of course, i don't experience any wobble or shimmy when my road bike has the tire. Do any of you have this sort of wobble since I would imagine most of your electric bikes are rear heavy? Anyone have a better explanation for this?