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  1. Leo3

    RJ Speed pro mod tuning.

    Not the stock gearing. 25 tooth pinion(not stock) 81 tooth spur (stock). It jitters off the line.
  2. Leo3

    RJ Speed pro mod tuning.

    I have a pro mod running a castle sidewinder 3 with a 7700kv castle. Trying to gear it. What size pinion should I try, with that 7700kv motor
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