Spoke Length Calculator

ERD - Effective Rim Diameter (mm)

Inner diameter of the rim where spoke nipple seats

Hub Flange Diameter - DS (mm)

Hub Flange Diameter - NDS (mm)

Center-to-Flange DS (mm)

Center-to-Flange NDS (mm)

Spoke Hole Diameter (mm)

Spoke Count (total)

Cross Pattern

Results

Drive Side Spoke Length—

Non-Drive Side Spoke Length—

Nearest Available (DS)—

Nearest Available (NDS)—

Formula: Uses the standard trigonometric spoke length formula.
L = sqrt(d² + r² + (ERD/2)² - 2·r·(ERD/2)·cos(a) - (hole/2)²)
Where d = center-to-flange, r = flange radius, a = crossing angle. Spokes are typically sold in 1mm increments; round down.