Understanding Compound Gear Ratios

Selecting gears strong enough to do the job you need them for is great but what if those gears are too big to fit in the space you have available? How do you get the same gear ratio from smaller gears? You use a compound gear train and Matthias Wandel explains how to work out the gear sizes in this video.

Here is my video in which I took a look at some cheap gear sets you could get on ebay.

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