Determining which EVELO will best work for you in terms of bit may seem challenging without trying the bike first, but it can actually be accomplished relatively easily. Please check out the chart below and then request a Free Fit Consultation. One of our electric bike experts will get back to you in 24 hours or less! NOTE #1: The above chart is a rough guide. Please fill out our fit questionnaire here for additional guidance. NOTE #2: Please note that the Aurora 19.5 is currently only available with NuVinci N360 and in White Frame color. If you wish to order this model, please specify "Aurora 19.5" in the Special Order Instructions when you place your order.