Lean Angle Calculator

Calculate safe lean angle from speed, turn radius, and tire grip coefficient.

Inputs

Speed

mph

Turn Radius

Tire Grip Coefficient

Tab to move between fields

Results

Required Lean Angle

43.3°

Max Safe Lean Angle

45°

Max Safe Speed61.8 km/h

Safety Margin1.7°

Within Safe LimitsYes

How to Use This Calculator

Enter Speed, Turn Radius, and Tire Grip Coefficient.
Review Required Lean Angle (°) and Max Safe Lean Angle (°).
Use Max Safe Speed (km/h) and Safety Margin (°) to inform your decision.

How the result changes with Speed

Speed	Required Lean Angle	Max Safe Lean Angle
35	17.8°	45°
108	71.9°	45°
197	84.4°	45°
271	87°	45°

What each input means

Speed: Motorcycle speed through the turn.
Turn Radius: Radius of the turn in meters.
Tire Grip Coefficient: Tire friction coefficient (0.7 wet, 1.0 dry street, 1.3 race slicks).

How this is calculated

Worked example, using the default values

Identify Input Parameters
Speed = 60, Turn Radius = 30, Tire Grip Coefficient = 1 = 3 input(s) provided
Calculate Required Lean Angle
43.3 = 43.3
Calculate Max Safe Lean Angle
45 = 45
Calculate Max Safe Speed
61.8 = 61.8
Calculate Safety Margin
Safety Margin
1.7 = 1.7

Engine last updated July 28, 2026. Checked against 2 independently-derived tests — how we verify calculators.

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