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Gear Ratio Calculator

Dial in your pinion and spur in seconds — free, with rollout and FDR.

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Ask your AI RC mechanic

Get answers about setups and gearing in seconds, always handy.

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Free to start · iOS & Android

Setup App & Race Log

Your HB E819RS is in the RC Setup App

Save every setup change you make to your HB E819RS, get AI tuning answers for that exact car, and log your races — at the track or back in the pits.

  • Setup Tracking
  • AI Mechanic answers
  • Find & Share Setups
  • Race Log
  • Gear Ratio Calculator
  • Free to use
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