"The 20 'inch wheel folder is just better in almost every regard. It's provides a stable, comfortable and fast ride without sacrificing gears unlike its 16 inch cousin. I could not recommend a 16' inch wheel folder unless the person wanted to enter the bus on a frequent basis (multimode transport). Since very few people do this, I believe that 99% of all folding bike purchases should be for a 20' inch model. In fact, in all my days, I've never seen anyone bring a 16' inch wheel folder inside a bus." -Dahon.Steve

Um, maybe you have seen a 16" inch wheel folder on a bus. I take my Brompton with me on the cabin of a bus, very crowded trains, etc.-hidden in it's bag. In fact I selected the Brompton over the Piccolo because it's folded size wins hands down. Plus it's suspension system is built right into the frame. The folded size is ideal when you go into crowded establishments-try to manuver a larger folder through tight crowds of unyielding people without poking them with the pedals or frame parts. Then add a problem of being a smaller person and you will begin to see why 16" wheels win for some situations. I also have a Boardwalk for more distant little or no multimode use or taken in a indoor crowded areas. For that, it works well. I no longer have derailleurs for many reasons. I prefer hubs since I am not a high performance rider anymore.