Ahah - I just read the specs and noticed that they use a smaller sprocket chain to allow for more teeth on the chainring resulting in a "Gear inch" ratio of 48. My Tokyo with the modified sprocket has a ratio of 66", prior to Mods was 52" - with vigorous pedaling however, I could still get the bike up to almost 20 mph (almost 23mph now). Depending upon your physical condition; I am guessing that 48" could attain a max speed of perhaps 17 - 18mph and likely comfortably "Cruise" at over 10mph - seems acceptable for your intended use...