SOURCE-BACKED HUB & RIM SPECS

BMX Spoke Calculator

Find the exact spoke length for your BMX wheel build, then see the standard buy length without hiding the raw calculation.

Component presets

Build Setup

Hub Rim

Manufacturer dimensions with transparent source details

Spoke Count Lacing

Enter measurements manually

Calculated for this wheel

Your Spoke Length

Drive side

Exact —

Buy—

Non-drive side

Exact —

Buy—

Buy length rounds upward to the next 2 mm BMX spoke size. Exact length stays visible.

Measurements used mm

ERD—

DS PCD—

NDS PCD—

DS FTC—

NDS FTC—

Hole Ø—

Measurements & Sources →

Versioned Specs

Presets carry a source, checked date and specification context instead of an unexplained number.

Exact + Buy Length

See the raw geometry result beside the standard 2 mm purchase recommendation.

Manual Measurement Mode

Enter ERD, PCD, flange distances and spoke-hole diameter when your component is not in the preset list.

STARTER COMPONENT DATA

Measurements you can inspect

Every preset links to the page used for its published dimensions. Manual mode remains available for your own measurements.

TRANSPARENT CALCULATION

The geometry stays visible

The calculator uses ERD, each flange PCD, each center-to-flange distance, hub spoke-hole diameter, total spoke count and cross pattern. Drive and non-drive sides are calculated independently.

L = √(R² + r² + w² − 2Rr cos θ) − d/2 R = ERD/2 · r = PCD/2 · θ = 4π × crosses / spokes