I ran my car on Friday indoors and ran the std pulleys and spur gear with a 21T pinion which gives an overall ratio of 10.21 and this was on a 5.5 Team Orion motor and LRP Spere TC ESC and felt that it had a very high top speed but felt that it was a bit gutless in the infield. When I have looked at the ratios I noticed that on my X-5 I used to use 16/108 which gave me an overall ratio of 11.81 so I may try getting closer to this so I expect an 18t pinion is nearest on the standard setup.
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