It's on my truck, but it doesn't make a difference here. I have it on my truck because that's the vehicle I pay the lowest rates on and I was required to raise my liability to 500/500/100 to carry that much UM. I have 250/500/100 on all my other vehicles because I have an umbrella. But the UM premium is the same no matter which vehicle I put it on and that UM would apply to a motorcycle. I sold my bike about 2 years ago after a car wreck. I can't ride anymore because of it. But my UM paid out in that car wreck and I wasn't driving a car I even owned.My life is not worth riding a motorcycle when some *** in a car sideswipes me. UM coverage may be cheap on a auto, are you talking about $30 per month on the motorcycle policy? It's not very cheap here in Florida.