Harley-Davidson Trike Motorcycles : Harley-Davidson® Motorcycles - Harley-Davidson® USA - Harley-Davidson Motorcycles for sale. Find a new or used Harley-Davidson for sale from across the nation on CycleTrader.com. It started over one hundred years ago. A motorcycle. A philosophy. A way of life. Call it what you like. But the very first instant, the very first moment, you lay eyes on a Harley-Davidson motorcycle, you know it for what it is. A rolling testament to staying true.