Spoke length

Enter your measured hub and rim numbers. Measure them — published figures are often for a different generation of the same hub, and a 2 mm error is a ruined spoke order.

How to measure this

5 steps

1Measure the flange

Callipers across two opposite spoke holes in the hub flange, centre to centre. Measure both flanges — on most rear hubs they are not the same.

Hub

Flange hole circle diameter — Left

Flange hole circle diameter — Right

Across the centres of two opposite spoke holes in the flange.

Centre to flange — Non-drive side

Centre to flange — Drive side

From the wheel centreline to the inner face of the flange.

Spoke hole diameter

The hole in the flange, usually 2.5-2.6 mm. The elbow sits at the hole edge.

Rim

Effective rim diameter (ERD)

The diameter the spoke nipples seat on. Measure it; catalogue ERDs are often wrong.

Work out ERD from measuring rods

Measured across both rods

Length of one rod past the nipple seat

Rim spoke-hole offset

For asymmetric rims. Positive shifts the holes toward the drive side. Leave at 0 for a symmetric rim.

Lacing

Spoke count

Crossings — Non-drive side

Crossings — Drive side

Same lacing both sides

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