RC Active Rear Toe Explained
What Is Active Rear Toe?
Active Rear Toe is the change in rear toe angle during suspension movement.
In a static setup, rear toe is fixed. But in a dynamic system, the angle shifts as the suspension compresses under load or extends when unloaded.
• Toe-In: Rear tires point inward
• Toe-Out: Rear tires point outward
Most RC setups are designed so that the rear gains Toe-In under compression, which helps stabilize the car when it needs it most – during cornering and acceleration.
This behavior is built into the suspension through:
• Rear hub geometry
• Suspension arm angles
• Hinge pin positions
In simple terms, Active Rear Toe allows the car to adjust rear grip automatically as the chassis loads and unloads.
How Active Rear Toe Affects Your Car
Active Rear Toe plays a major role in how your car behaves through all phases of a corner.
Corner Entry
When entering a corner:
• More Toe-In gain keeps the rear stable
• Less toe change allows the car to rotate more freely
If your car feels twitchy or loose on entry, adding Active Rear Toe can help calm it down.
Mid-Corner
As the suspension compresses:
• Increased Toe-In adds rear grip
• Helps the car stay planted through sweepers
This is especially helpful on high-speed tracks where stability is critical.
Corner Exit
Under acceleration:
• More Toe-In gain improves forward traction
• Reduces the chance of the rear stepping out
If your car spins out when you apply throttle, this is a key adjustment to consider.
Rough or Bumpy Surfaces
On uneven terrain:
• Active geometry can either stabilize or unsettle the car
• Too much toe change can make the rear feel inconsistent
Smooth, predictable toe gain is the goal.
How to Change Active Rear Toe
Active Rear Toe is adjusted through geometry changes, not just simple alignment tweaks.
Rear Hubs and Inserts
Many RC cars use:
• Adjustable hub inserts
• Different toe block configurations
These change how the hub moves through suspension travel, altering toe gain.
Suspension Arm Mounting
Changing hinge pin locations:
• Inner hinge pin height
• Outer hinge pin height
This affects the arc of suspension movement and how toe changes under load.
Aftermarket Tuning Parts
Some platforms offer:
• Adjustable rear hubs
• Variable geometry toe blocks
These provide more precise control over active toe behavior.
When To Increase Or Decrease Active Rear Toe
Increase Active Rear Toe (More Toe-In Gain)
Use this when you want:
• More rear stability
• Better forward traction
• Smoother corner exits
Ideal for:
• Low-grip tracks
• High-power setups
• Loose or oversteering cars
Downside:
• Reduced steering response
• Lower rotation
Decrease Active Rear Toe (Less Toe Change)
Use this when you want:
• More rotation
• Faster cornering
• A freer rear end
Ideal for:
• High-grip tracks
• Tight layouts
• Advanced drivers pushing for speed
Downside:
• Less stability
• Easier to lose rear traction
What to Check After Changing Active Rear Toe
Whenever you adjust Active Rear Toe, you should review related suspension settings to maintain balance.
Static Rear Toe
• Works together with active toe
• More active toe may allow less static toe
• Less active toe may require more static toe
Camber Gain
Geometry changes can affect how Camber changes under compression.
Watch for:
• Uneven tire wear
• Reduced contact patch
Rear Roll Center
Adjustments may impact Roll Center height, which affects:
• Side grip
• Weight transfer
Anti-Squat
Active Toe and Anti-Squat interact under acceleration.
• More of both = strong stability under power
• Too much can reduce rotation
Shock Setup
After making changes, revisit:
• Shock oil
• Spring rate
• Shock mounting position
Tires
Always check:
• Tire wear
• Temperature across the tire
This gives real feedback on whether your setup is working.
FAQ
Q: What is the difference between static and Active Rear Toe?
A: Static rear Toe is a fixed angle set while the car is at rest. Active Rear Toe changes dynamically as the suspension moves during driving.
Q: Does more rear toe always mean more grip?
A: Not always. More Toe-In generally adds stability and traction, but too much can reduce corner speed and responsiveness.
Q: Is Active Rear Toe adjustable on all RC cars?
A: No. Some entry-level cars have fixed geometry, while higher-end kits offer adjustable hubs, inserts or link positions to tune Active Toe.
Q: How much Active Rear Toe should I run?
A: There is no universal setting. Start with your kit’s recommended setup and make small adjustments based on track conditions and driving feel.
Q: What is the best way to tune Active Rear Toe?
A: Change one variable at a time and test on track. Pay attention to corner entry, mid-corner stability and exit traction to evaluate your adjustments.
Related Tuning Adjustments
To get the most out of this setup change, review these related guides:
• Toe In / Toe Out
Back to the RC Suspension Tuning Guide.
