Interestingly, at least to me, in 2004 Walter Lapchynsky, who was working at Bike Friday posted his fixed gear pocket rocket with 20 inch wheels and equipped with what he called heavier parts on Fixedgeargallery. This portly bike weighed in at 16.5 per Walter. The handlebar stem folded I believe. I think I would rather have Walter's bike than a single speed backpacker.