Spoke Length Calculator

Spoke length from hub, rim, and lacing pattern.

ERD - Effective Rim Diameter (mm)

Drive flange offset (mm)

Non-drive flange offset (mm)

Drive flange PCD (mm)

Non-drive flange PCD (mm)

Spoke hole diameter (mm)

Spoke count

Cross pattern (0-4)

Tab to move between fields

Drive-side length (mm)

293.4

Non-drive length (mm)292

Drive-side order (mm)293

Non-drive order (mm)292

Side difference (mm)1.4

Spokes per side16

Total spokes needed32

How to Use This Calculator

Enter ERD - Effective Rim Diameter (mm), Drive flange offset (mm), and Non-drive flange offset (mm).
Set Drive flange PCD (mm), Non-drive flange PCD (mm), and Spoke hole diameter (mm).
Adjust Spoke count, Cross pattern (0-4) as needed.
Review the Drive-side length (mm) result.
Use Non-drive length (mm) and Drive-side order (mm) to inform your decision.

How the result changes with ERD - Effective Rim Diameter (mm)

ERD - Effective Rim Diameter (mm)	Drive-side length (mm)
430	207.3
505	244.1
595	288.5
670	325.6

ERD - Effective Rim Diameter (mm): Effective Rim Diameter: measure from nipple seat to nipple seat across the rim.
Drive flange offset (mm): Center of hub to drive-side flange center.
Non-drive flange offset (mm): Center of hub to non-drive-side flange center.
Drive flange PCD (mm): Pitch circle diameter of spoke holes on drive-side flange.
Non-drive flange PCD (mm): Pitch circle diameter of spoke holes on non-drive-side flange.
Spoke hole diameter (mm): Diameter of spoke holes in the hub flange (typically 2.4-2.8 mm).
Spoke count: Total number of spokes in the wheel.
Cross pattern (0-4): Lacing pattern: 0 = radial, 1 = 1-cross, 2 = 2-cross, 3 = 3-cross (most common).

Drive-side length (mm): Calculated spoke length for the drive side.
Non-drive length (mm): Calculated spoke length for the non-drive side.
Drive-side order (mm): Drive-side length rounded down to nearest whole mm for ordering.
Non-drive order (mm): Non-drive length rounded down to nearest whole mm for ordering.
Side difference (mm): Difference in spoke length between drive and non-drive sides.
Spokes per side: Number of spokes needed per side.
Total spokes needed: Total spokes to purchase (add 2-4 spares recommended).

Identify Input Parameters
4 parameters
ERD - Effective Rim Diameter (mm) = 605, Drive flange offset (mm) = 35, Non-drive flange offset (mm) = 20, Drive flange PCD (mm) = 58 = 8 input(s) provided
Calculate Drive-side length
Drive-side length = calcSpokeLength(flangeDistanceDrive, flangePcdDrive)
293.4 = 293.4
Calculate Non-drive length
Non-drive length = calcSpokeLength(flangeDistanceNonDrive, flangePcdNonDrive)
292 = 292
Calculate Drive-side order
Drive-side order = floor(driveSideLength)
293 = 293