We bought 2 Rad City bikes for Christmas 2021 when they were the latest model. We loved them until a controller failed and we were told we were 4 days out of warranty. The warranty starts the day they are delivered (Nov 2021). Since then I've been trying to BUY a replacement part. You can't place an order if they don't have the part in stock. They are out of stock. They were out of stock in November, each month I'm told they'll have the part at the beginning of the next month. It's now February and I don't even have an order placed. Clearly, the controllers have a problem! I expected a high-quality bike from a reputable company. With my experience, I fear that RAD will go out of business and my $4000s will have turned into aggravation and a total loss.