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Motorcycle Lean Angle Calculator

Calculate the required lean angle for a given corner radius and speed. Determine lateral G-forces, maximum safe speed, and your margin to the grip limit.

Inputs

ft
mph
mm
lb

Results

Lean Angle

45.2°

Lateral G-Force1.01 G
Max Safe Speed95.3 km/h
Slip Margin11.6°
How to Use This Calculator
  1. Enter Corner Radius, Corner Speed, and Rear Tire Width.
  2. Set Rider + Bike Weight.
  3. Review the Lean Angle (°) result.
  4. Use Lateral G-Force and Max Safe Speed (km/h) to inform your decision.

How the result changes with Corner Speed

Corner SpeedLean Angle
4416.9°
12969.1°
23183.2°
31686.4°

What each input means

Corner Radius
Radius of the turn in meters. Tighter corners (lower values) require more lean at the same speed.
Corner Speed
Speed through the corner in km/h. Measured at the apex or from data logging.
Rear Tire Width
Rear tire width in mm (e.g., 120 for sport, 180 for supersport, 200 for superbike).
Rider + Bike Weight
Combined weight of rider and motorcycle in kg. Affects tire loading and contact patch size.

What each result means

Lean Angle
Required lean angle from vertical. Most sport bikes can reach 50-55 degrees.
Lateral G-Force
Centripetal acceleration expressed as a multiple of gravity.
Max Safe Speed
Maximum theoretical speed for this corner assuming 55-degree lean limit.
Slip Margin
Degrees of lean angle remaining before reaching the theoretical grip limit. Wider tires add margin.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Corner Radius = 50, Corner Speed = 80, Rear Tire Width = 180, Rider + Bike Weight = 280 = 4 input(s) provided
  2. Calculate Lean Angle
    Lean Angle
    45.2 = 45.2
  3. Calculate Lateral G-Force
    Lateral G-Force
    1.01 = 1.01
  4. Calculate Max Safe Speed
    Max Safe Speed
    95.3 = 95.3

Engine last updated . Checked against 1 independently-derived test — how we verify calculators.

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