So, in today's ebike economy, do you need a qs273 for your mountain bike conversion? well I want to explain my opinion.https://www.amazon.com/dp/B07Z37H8ML/ref=cm_sw_r_as_gl_apa_gl_i_PNZ4SWWVRJMQ10J9NQ05?linkCode=ml2&tag=ebikeguy08-20https://amzn.to/46W9y55