Just wondering if someone has the same experience, and if there is a fix for it. I have a Jetblack Volt, and it is pretty silent, apart from a whop whop sound that I think must come from the flywheel. As far as my spirit level can tell, the floor is level. Anyone know if there’s a way to stop the sound? It’s not very loud, but it’s the type of sound that easily travels through walls.
Are you using a disc rear wheel? 
Sorry…couldn’t resist.
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Hmmm…essentially yes, a very heavy and small one (flywheel before anyone asks…). Its sort of the same sound, just less hollow.
