This guide will help you restore the ratio range or top speed on your Heavy Duty (HD) and Extreme 148mm modular axle hubs.

Backward compatibility

This guide is compatible with legacy 148mm modular axle hubs (Sportive/SP, Cargo/CA).

Problem diagnosis

Upon inspection, you detect one of the following:

• The hub does not reach the full or correct gearing (ratio range):
  • Urban - 256%
  • City - 310%
  • Trekking - 380%
  • Heavy Duty - 380%
  • Extreme - 380%
• Top speed doesn’t seem to be reachable at a reasonable cadence.
• The manual hub interface may be incorrectly installed, hence not allowing the full range.

Solution

You will need to perform different checks depending on the transmission system you have:

Automatic shifting system

1. Calibrate the AHI using the AUTOMATiQ App.
   See detailed instructions
2. On speed pedelecs, make sure the correct primary ratio is selected.

Manual shifting system

1. Reset to full overdrive using the MHI.
   See detailed instructions
2. Ensure the cable slack is correct.
   See detailed instructions
3. Ensure the cable length is correct.
   • See detailed instructions with the cable-cutting tool
   • See detailed instructions without the cable-cutting tool
4. On speed pedelecs, make sure the correct primary ratio is selected.

Done

If you successfully followed the steps above, then the ratio range should be restored.

If the problem persists, contact support.