Use the formula
where `w` is the angular velocity, V is the linear speed and r is the radius of the wheel.
Convert r from inches to miles.
1 inch = 0.000016 miles
r= 14 in x 0.000016 miles/inch = 0.000224 miles
`omega=55 /0.000224=245,536` radians/hour
Thus the angular velocity is 245,535 radians/hour.