It also depends on which motor you are running: a fast motor (say 6.5t) is generally geared lower than a slower one (9.5T). Many motors will come with a recommended Final Drive Ratio that you should aim for (these are what the numbers relate to in Rob's table).
I run a 6.5T in my Losi 22 and have a final drive ratio of 9.23 (20/76). This could be a good starting point as it gives me a good balance of speed/acceleration without getting too hot.
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