I also counted my gearing on the front and back gears to see what that might translate into for mph.
On the front gear I have 3 gears, with 30, 42, and 52 teeth respectively.
On the rear gear I have 8 gears, with 12, 13, 15, 17, 19, 21, 23, and 25 teeth respectively.
Given the tire sizing, one complete tire rotation is roughly 86.35 inches traveled.
Putting this all together I can figure out the ideal mph for each gearing ratio, as follows:
|52 teeth||42 teeth||30 teeth|
This has a few interesting features. First, I should be pedaling a lot faster, instead of harder. Second, I had always assumed that the middle front gear was always a higher ratio than the smaller gear. It turns out that some of the ratios with the smaller gear in the front can actually be higher, so it is not always a low, medium, high gearing in terms of speed.
I can use this information with my bike computer to determine which gearing I should be using, in an ideal situation. I have previously just been going based on changing gears whenever it felt too easy or hard to pedal. I'll have to see how this actually goes though, but now I have some data to use.