Although very rare, sometimes the spline nut is broken or loose. This guide explains how to replace and tighten the spline nut on 135mm solid axle hubs.

Backward compatibility

This guide is compatible with legacy 135mm solid axle hubs (Commercial/CO, Sportive/SP, Cargo/CA, N360, N380, N380SE).

Step-by-step instructions

Use the spline nut tool to prevent damage

Be careful not to damage the spline nut. Make sure to use only the recommended Enviolo spline nut tool to tighten the new spline nut.

148mm modular axle hubs do not apply

Tightening the spline nut is not applicable to 148mm modular axle hubs, as in such hubs the spline nut is integrated and does not need to be tightened.

Video

Tools

• 10mm torque wrench
• Vice
• 44T spline nut
• Spline nut tool

Instructions

1. Mount the wheel, clamping the left axle (brake) side in a vice.
2. Rotate counterclockwise to remove the old spline nut from the axle.
3. Place a new spline nut onto the axle.
   • Make sure to only use the Spline Nut tool (see image above) for the spline nut reassembly procedure.
   • Torque it to 8Nm approximately.
4. If this repair is done before wheel lacing, then put back the anti-shift retainer.