because 19 turns arnt modified, they are quite strange motors! We gear 19's seperately because they are different in ways.
10- 22/81
11- 23/81
12- 24/81
etc
etc
then 19 turn comes and it needs a completely different gearing, bit bizzare.. but the way it works! I run 19's alot in a club series and 23/24/81 works best for me.
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