Problem diagnosis
- The manual hub interface (MHI) rotates, but no shifting takes place.
- The hub interface slips or spins.
Solution
- Check if the MHI is compatible with the hub.
- Check if the spline nut is correctly assembled.
1 - Check if the MHI interface is compatible with the bub
Your manual hub interface (MHI) should be compatible with the hub on your bicycle. If not, you will need to replace it with a compatible one which you can order at our orders platform.
There are 2 variants of the Manual hub interface (MHI) with different spline nuts (A) – 40T and 44T.
Their compatibility with Enviolo hubs depends on the year of the hub. Since 2025, we commmonized all hubs with 40T, but some older hubs have 44T splines:
2025
- Hubs with 40T – All hubs are commonized with 40T.
- Hubs with 44T – Discontinued.
2024 and earlier
-
Hubs with 40T
- 148mm modular axle – All modular hubs.
- 135mm solid axle - Heavy Duty, Extreme, Extreme Gearbox, CA.
-
Hubs with 44T
- 135mm solid axle - Urban, City, Trekking, CO, SP, CA.
2 - Check if the spline nut is correctly assembled
Check the spline nut and tighten it if necessary. See these guides for details, depending on the axle you have:
- How to assemble the Manual hub interface on a 135mm solid axle rear wheel
- How to assemble the Manual hub interface on a 148mm modular axle wheel
If the problem persists
If you follow all the steps above, you should be able to shift smoothly again. If the problem persists, don't hesitate to contact our support team.