py-tire-size-calculator is a demonstration of calculating the height of a tire given its width, sidewall ratio, and rim size.
Given a tire size of 225/40R16, we can calculate the tire's height in inches as illustrated in the flowchart below:
flowchart LR;
id1(225/40R16)-->|tire width|id2(225mm)-->|mm to in|id3(225mm / 25.4 = 8.85 in);
id1-->|tire aspect ratio|id4(40)-->|divided by 100|id5(.40);
id1-->|rim size|id7(16 inches);
id3-->id96(8.85 x .40 = 3.54 in);
id5-->id96;
id96-->|x2|id97(7.08 in);
id97-->|sidewall height|id98(7.08in + 16in);
id7-->id98;
id98-->id99(23.08 inches);
Takes tread_width + sidewall as inputs and returns the sidewall height in inches.
Sidewall height must be divided by 100 in order to be used correctly as a percentage value.
Arguments
tread_width : int - tire width measured in millimeters
sidewall : int - the sidewall value listed on the tire size
def sidewall_height(tread_width: int, sidewall: int) -> float:
return (tread_width * (sidewall / 100)) / 25.4
Takes tread_width, sidewall, and rim values as inputs. The tread width value is sent as an argument to sidewall_height() which returns a float of the sidewall height in inches.
Finally, wheel_height returns (sidewall height * 2) + rim size.
Arguments
tread_width : int - the tire width measured in millimeters
sidewall : int - the sidewall value listed on the tire size
rim : int - the height of the rim in inches
def wheel_height(tread_width: int, sidewall: int, rim: int) -> float:
return (sidewall_height_value * 2) + rim
print(f"This wheel is: {wheel_height(225, 40, 16)} inches tall.")