New to ebikes and may purchase one. Considering the Magnum line. I have rented a mid-drive and will rent a PAS/Throttle to see the difference. I looked on Magnum's web site and saw both the Navigator and the Metro. I saw a Metro in person but not yet a Navigator. There doesn't seem to be much difference between the two. Wheels are a bit taller on the Navigator and some other things. Anything I should pay attention to between the two? Thanks.