One of the most effective method to compare gear ration is by the use of gear inches.
In the day of high wheeler bicycles, there is no gearing. The rev per min of pedal equates to the rev per min of the wheels. The load on the pedal is determined by the diameter (radius) of the wheels.
How to do it?
1. Measure the circumference of the wheel. There are a few methods
a. you may measure the radius of the wheels with tires and multiply by 2xpi.
or b. you may roll the bike on the floor starting from the valve and end at the valve. The distance travelled on the ground is the circumference.
2. Count the teeth on the cogset. For all sprocket
3. Count the teeth on the chain ring. For all chainring
4. Make a chart of chainring divided by sprocket and multiply by wheel circumference.
5. It is done.
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