Home Forums Tech Talk gear ratio /tm k9c

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    • #39790

      Just purchased a tm k9c,  I plan on running open 125. The track is 2.2mile 9turns the main straight is a 1/4 mile drag strip. I plan on running a 50mm axle, can anyone give me a good gear ratio for that long of a straight

    • #39794
      Glenn L Riggs

      I would try a 18/21 as a starting point

    • #40398
      Antonino Esposito


      I’m a italian boy and I’m sorry for my english!!!

      Anyway, also I have a tm k9c, it’s very good engine!!! The track with  the main straight of 1/4 mile It’s very long. I think that a good starting point to gear ratio is 19×22 !

      At 13800 rpm your final speed will be 170 Km/h

    • #41456
      Richard Kirlin

      I’ve raced TM motors on big road course,  a 19/21-22,  18/21-22 will work depending  on weight and hight of the person?


      best of luck:)



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