Potentiometer

A potentiometer (often called a "pot") is a type of sensor used in entry-level sim racing pedals that measures the physical position or travel of the pedal. Most pedals included with wheel bundles (Logitech G29, Thrustmaster T300, etc.) use potentiometers.

How Potentiometers Work

A potentiometer consists of a resistive track and a wiper that slides along it. As you press the pedal, the wiper moves, changing the electrical resistance. The pedal reads this resistance and translates it to a position value (0-100% travel).

Think of it like a volume slider—what matters is where the slider is positioned, not how hard you're pushing it.

Potentiometer Characteristics

Measures travel, not force: A potentiometer pedal at 50% travel registers 50% input regardless of how hard you're pressing.

Lighter feel: Without the resistance of a load cell, potentiometer pedals typically feel softer and spongier.

Good for throttle/clutch: Position-based sensing works perfectly well for throttle and clutch pedals, where travel matters more than pressure.

Adequate for brake: While not ideal, potentiometer brakes are functional. Many fast sim racers developed their skills on potentiometer setups.

Why Potentiometers Are Common

Cost: Potentiometers are inexpensive to manufacture, keeping entry-level products affordable.

Simplicity: They're reliable, well-understood technology with no complex calibration requirements.

Good enough to start: For casual sim racing and learning, potentiometer pedals work fine.

Limitations for Braking

Real car brakes respond to pressure, not travel. With a potentiometer brake:

• You must develop muscle memory for pedal positions rather than force
• Consistency can vary (hitting exact positions is harder than applying exact pressure)
• "Trail braking" (gradually releasing brake through a corner) feels less intuitive

This is why load cell brake upgrades are so popular—they address the main weakness of potentiometer setups.

Potentiometer Durability

Potentiometers can wear over time:

• The resistive track can degrade, causing "spiky" input or dead zones
• Dust and debris can interfere with the wiper
• Heavy use accelerates wear

Most potentiometer pedals last 1-3+ years of regular use before issues appear. Cleaning and contact cleaner can extend their life.

Upgrading from Potentiometer Brakes

The most common upgrade path:

1. Replacement pedal set: Buy dedicated load cell pedals (Fanatec CSL LC, Thrustmaster T-LCM)
2. Brake mod: Add aftermarket load cell kits to existing pedals (some third-party options for Logitech)
3. Keep for throttle/clutch: Some users keep potentiometer pedals for throttle/clutch and add standalone load cell brake

Related Terms

• Load Cell: Pressure-based sensor, the upgrade from potentiometers
• Pedal Face: The surface your foot contacts
• Hall Effect: Magnetic position sensor (alternative to potentiometer)