Chassis & setupCounter-steer
Counter-steer ratio
How much faster the rear wheels turn than the front, from the pulleys or gears fitted.
Drivetrain
Front
Rear
The pulley or gear at the axle over the one on the centre shaft driving it. Fewer teeth on the centre pulley slows that end and raises counter-steer. Gear-driven chassis work the same way with bevel tooth counts.
Tires
Equal front and rear is the usual case and leaves the ground figure equal to the wheel figure. Set them apart only if the car really runs different sizes.
Counter-steer
Rear turns per front turn
Enter positive front and rear drive ratios.
Reach a counter-steer number
Enter a counter-steer figure to see which front centre pulley lands closest.
How this is calculated
Each axle's drive ratio is the pulley or gear at the axle divided by the one on the centre shaft feeding it. Counter-steer is the front ratio divided by the rear ratio, which is the number of rear wheel turns per front wheel turn. A bigger ratio at an axle means a slower wheel, so raising front reduction raises counter-steer.
Tire diameters do not change what the wheels do, only what the ground sees: the contact figure multiplies the wheel figure by the rear diameter over the front.
This is the same pair of numbers the crawler reduction and overdrive tool works on, stated the other way round. A crawler drives the front faster and quotes a percentage; a drift chassis drives the rear faster and quotes a bare ratio.
Read the methodology