Hey! I have two bicycles. This post is about my first one: A 1985 ST400 touring bike by Cannondale. My other is a 2012 Cannondale, but this post is not about that one. My crank length is 172.5mm, the tire is a 27 x 1 1/4" (32-630), and my chainring is 50/45. The freewheel gears are 13/16/19/23/28/34. The weight of the bike is 24 lbs. Components are all Shimano 600. I'm generally on the small ring, second-smallest freewheel ring. That means for me to maintain 20mph, I have to do 87 rpm's. If I kept it on the same freewheel ring and just put the chainring on the 50 tooth one, I could maintain 20mph with a cadence of 78. Using my present bike: Goal: 22mph - 45/13 @ 78 rpm 50/16 @ 86 23mph - 50/16 @ 90 45/13 @ 81 24mph - 45/13 @ 85 50/13 @ 76 25mph - 45/13 @ 88 50/13 @ 79 26mph - 45/13 @ 92 50/13 @ 83 27mph - 50/13 @ 86 28mph - 50/13 @ 89 29mph - 50/13 @ 92 30mph - 50/13 @ 95 (hi) Quickly obvious from the chart above is that my ideal gear for 22 mph is e