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Good Job so far man. You definatley have a great plan for going about this...
I think the 1717 is a good choice as well because it can probably take close to a 1:1 ratio on the pinion/spur, with the GRP tires being so light it will run fine. Probably giving you more attempts at 100+ before it heats up too much as well. Just gotta run some extra voltage...
The GRPs are just great for the speed runs too!