← ALL GUIDES
🦷
BEGINNER TO ADVANCED

GEARING GUIDE

Balance acceleration, motor load and top speed with a legal ratio.

SECTION 01

What the ratio means

  • →A lower number such as 3.5:1 turns the wheels farther per motor revolution and favors top speed.
  • →A higher number such as 5:1 multiplies torque and favors acceleration and climbing.
  • →The fastest useful ratio depends on motor, tire diameter, car weight and track layout.
  • →Only use gear combinations supported for your chassis.
SECTION 02

Quick ratio reference

RatioBiasUse it when
3.5:1High speedLong straights, controlled motor and stable lightweight car
3.7:1Speed-balancedFast mixed tracks
4.0:1BalancedGeneral-purpose setup and first testing
4.2:1Torque-balancedTechnical layouts, slopes or heavier cars
5.0:1High torqueLearning, steep layouts or weak motor/battery conditions
Ratio

3.5:1

Bias
High speed
Use it when
Long straights, controlled motor and stable lightweight car
Ratio

3.7:1

Bias
Speed-balanced
Use it when
Fast mixed tracks
Ratio

4.0:1

Bias
Balanced
Use it when
General-purpose setup and first testing
Ratio

4.2:1

Bias
Torque-balanced
Use it when
Technical layouts, slopes or heavier cars
Ratio

5.0:1

Bias
High torque
Use it when
Learning, steep layouts or weak motor/battery conditions
SECTION 03

A reliable testing method

  • →Start with a moderate motor and 4.0:1 or 4.2:1 gearing.
  • →Record lap behavior: acceleration, lane-change stability, motor temperature and battery drop.
  • →Change one variable at a time. A motor and gear change together hides the cause of improvement.
  • →Gear noise usually indicates poor mesh, bent shafts, debris or incorrect assembly—not a need for more grease.
BEFORE RACE DAY

VERIFY YOUR CLASS

Setup advice does not override the rulebook. Check the detailed class page and present uncertain configurations before official inspection.

OPEN RULEBOOKBROWSE SHOP