You want a rough estimate of your cadence. You know you were doing about 30 mph in the paceline in a 53 x 14. What was your cadence?
Use the input form on the right to enter speed, units in which speed is expressed, number of teeth on the front chainring, and number of teeth on the rear cog. Then click on the Run Model button. The input form returns a table with your data and an estimated cadence along with a plot of cadence verses speed.
Wheel diameter varies slightly by tire and inflation pressure. You can estimate diameter by measuring the distance covered by rolling the rear wheel one revolution and then dividing by Pi (3.14159). The result is the diameter of the wheel. Or you can use the default value and keep things simple.
In the example data, your cadence would be 100 rev/min.