The formula to calculate the center distance is:

\[ C = \left[ \frac{2Lp - T - t + \sqrt{\left(2Lp - T - t\right)^2 - 0.810(T - t)^2}}{8} \right] \cdot P \]

Where:

• \(C\) is the center distance in millimeters (mm).
• \(P\) is the pitch of the chain in millimeters (mm).
• \(Lp\) is the length of the chain in pitches.
• \(T\) is the number of teeth on the large sprocket.
• \(t\) is the number of teeth on the small sprocket.