The formula to calculate the chain length is:

\[ L = 2C + \frac{T_2 + T_1}{2} + \frac{(T_2 - T_1)}{4 \pi^2 C} \]

Where:

• \(L\) is the chain length in pitches.
• \(C\) is the center distance between sprockets in pitches.
• \(T_2\) is the number of teeth on the larger sprocket.
• \(T_1\) is the number of teeth on the smaller sprocket.