Technical FAQ with Lennard Zinn: LED lights, trainers and saddle adjustments

VeloNews technical writer Lennard Zinn is a frame builder, a formerU.S. national team rider and author of several books on bikes and bikemaintenance. Zinn's column is devoted to addressing readers'technical questions about bikes, their care and feeding and how we as riderscan use them as comfortably and efficiently as possible. Readers can sendbrief technical questions directly toZinn. Zinn’s column appears regularly on would seem like the ultimate night riding light would be an L.E.D.light for light weight and efficiency. Has there been anyone working