I don't think Rad does yearly model year updates like other ebikes. They probably respond to market changes with improvements to stay competitive with others. They had the 2015 model, made updates and kept everything the same for the entire 2016/2017 model years, and then rolled out the updated 2018 models. I'm willing to bet the tariffs will effect a lot of ebike manufactures because the tariffs hurt us more (consumers) compared to hurting the ebike companies or other countries.