The angle of lean can be calculated using the laws of circular motion. Bikes must lean during a turn to balance the relevant forces: gravitational, inertial, frictional, and ground support.
Formula:
ฮธ = arctan [v² ÷ (g ยท r)]
where,ฮธ = Angle of lean
v = The forward speed
g = Standard gravity (9.80665 m/s²)
r = Radius of the turn