Cycling Bikes For Sale

What are the advantages and disadvantages of a small sprocket on a BMX Bike?

I want ot put a small sprocket on my BMX bike and would like to know the advantages and the disadvanges of a small sprocket.
Would you go faster?
Do I have to pedal harder?
Is it easier to stay at a constant speed?
Is it harder/easier to get going?
Would I need to change my freewheel from a 16t to a 12t?

Those came about so you have better clearance for tricks.
The "micro" rings are meant to be used with a smaller rear sprocket. You can go down to a 14t freewheel with a flip/flop thread-on hub or down to a 9 with some cassettes, the smallest sizes like 9&10t are machined into the driver.
The easiest way to figure gearing is using a ratio instead of gear inches (that has some purpose for multigear bikes but is a it over the top for singlespeeds).
Anyway, standard 20" gearing is 44t front/ 16t rear that equals a 2.75 tooth ratio (44/16=2.75:1)
So if you want a 36 front and have the same pedaling resistance take 36/2.75= 13.09...and on:1. So a 36/13 ratio will feel the same as a 44/16.
To figure out if a gear ratio will be harder or easier to pedal just calcuate if the gear combo is more or less than 2.75:1, higher than 2.75 will be harder, less easier.
Disadvantages are higher chain wear due to tighter bends/ smaller diameter. And cost to swap both front and rear sprockets and possibly needing a different hub.

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