It depends, are you a serial motor swapper?
Do you do *lots* of changes to motor timing/boost etc?
The more changes you do, the more pinions (and spurs) you'll need to get it right.
I don't play with either changing motors or motor settings much, so i just have 4 or 5 pinions per car (the sizes i need actually overlap, which is nice, so 19 through to 25) and a spare spur either side of my "normal" one. This gives me about 10-12 different ratios to choose from for different tracks/set ups. Some are easy to swap (pinion), some aren't (spur changes)
As an aside, i've just started mucking around with a 21.5t class, so i'm probably going to need another 4 or 5 pinions (around the 35 tooth mark) and a couple of smaller spurs gears. As there is no overlap in FDR at all with my other (all but identical) car, which runs a 4.5t motor.
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