I just had to say, my commute bike is a Giant Halfway. I think the front ring is a 45 and the seven speed rear cog is 13 - 28 ish. Its got 20" wheels. I plotted the gears once I think top gear was ~74" low gear is probably in the 50's. I use every damn one of those gears on my "flat" commute from Hillsboro to Forest Grove and if there were more I'd use them too.
H (wuss)