When setting up the speed sensor its important to make sure that the red led light is on when the motor powers up. This needs to be approximately 2mm (1/8 inch) from the magnet. Refer to arrow below (Photo 4)
NOTE: If the speed sensor is not close enough then you will get an error code 21 or 15H on the display
If the red light is not coming on and off when the spoke magnet is going past the sensor then there could be a couple of reasons why.
Note: Likely if you are reading this page, the magnet just needs repositioning. However, assuming it is set up correctly, there are two other possibilities.
Edge cases In some rare situations like fatbikes, you may not be able to get the mount/magnet close enough. There are some examples of how to fix:
- The sensor hasn't been plugged in far enough and tightened fully up. Check connection and tighten.
- If the cable been damaged during riding then the cable will need to be repaired.
- Sensor is not close enough to the magnet. (needs to be less than 2mm) Note: Sometimes the motor will shut down without giving any error message due to magnet placement being too far from the sensor. Test that it is not a distance issue by physically holding the magnet/sensor in your hands and manually swiping the magnet across it while the bike is powered on, check to see if the LED flashes.
- If the sensor has been checked and its been set up correctly then the other thing is the sensor is faulty. New sensors can be purchased here:
Note: Likely if you are reading this page, the magnet just needs repositioning. However, assuming it is set up correctly, there are two other possibilities.
- The speedo itself has gone bad and needs replaced
- The controller is damaged and needs replaced
Edge cases In some rare situations like fatbikes, you may not be able to get the mount/magnet close enough. There are some examples of how to fix:
- Attach small 'rare earth magnet' to the existing magnet to extend its range, these can be found on ebay etc and are quite powerful
- Shim the chainstay before attaching the sensor mount. This involves placing something between the mount and the chainstay, affixing with something like doublesided tape, then running zipties over top to reinforce. For a short video explaining this see below
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