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Computer sensor issue

Old 03-16-18, 03:49 PM
  #1  
Trentkln27
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Computer sensor issue

I have a sigma wireless computer on my bike. And my bike has an aero shaped front fork. The speed sensor need to be tilted a bit towards the spokes to sense the magnet on the spoke. When I hit a bump the sensor aligns with the fork and is then to far to sense the magnet. Any suggestions to help the sensor stay put?
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Old 03-16-18, 05:06 PM
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Cut a little piece of rubber from an old tube into the shape of the sensor where it touches the fork. Use it between the sensor base and the fork. I've found that gives it a bit more traction to stay put. If that's not enough, then some double-stick (i.e. carpet tape) can give even more grip.
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Old 03-16-18, 09:02 PM
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Trentkln27
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I'll try the double sided tape and see how the ride goes tomorrow.
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Old 03-16-18, 09:09 PM
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If you're gonna use double sided tape I prefer VHB tape. Or mount the sensor so it aligns with the fork like it wants to and get a stronger magnet. A 1/2" x 1/8" neodymium works well. Just place it on top of the existing magnet and you're good to go.
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Old 03-17-18, 05:54 AM
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relocate the magnet and sensor to be down near the hub
the spokes are closer to the fork blades there
and the reduced linear velocity of the magnet improves sensor reading
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Old 03-17-18, 07:52 AM
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If you have disc brakes, put large magnet on inside of the rotor. Get one of the 1-1/8" type off amazon.
(outboard likely doesn't fit due to caliber)
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Old 03-18-18, 07:57 AM
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Originally Posted by xenologer View Post
relocate the magnet and sensor to be down near the hub
the spokes are closer to the fork blades there
and the reduced linear velocity of the magnet improves sensor reading
I do have the sensor at the bottom of the fork
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Old 03-18-18, 07:58 AM
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I think I've got it fixed now. It seems to be working fine
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Old 03-19-18, 08:44 AM
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late to the party, but wondering if it anyone mounts theirs on a back wheel & seatstay?
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Old 03-19-18, 09:08 AM
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Originally Posted by rumrunn6 View Post
late to the party, but wondering if it anyone mounts theirs on a back wheel & seatstay?


For a wired sensor, you pretty much have to get a computer with cadence to get enough wire to run it to the back wheel.


Wireless, IME it gets iffy at that range. Shorter riders (with smaller frames) may not have that issue.
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Old 03-19-18, 01:28 PM
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Originally Posted by rumrunn6 View Post
late to the party, but wondering if it anyone mounts theirs on a back wheel & seatstay?
I agree with @pdlamb. the range is too small. Alternative is to mount the head on the TT near your saddle!
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Old 03-20-18, 05:33 PM
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Originally Posted by pdlamb View Post
For a wired sensor, you pretty much have to get a computer with cadence to get enough wire to run it to the back wheel.


Wireless, IME it gets iffy at that range. Shorter riders (with smaller frames) may not have that issue.
Garmin combined speed/cadence sensors are designed to be mounted on the rear wheel. Any ANT+ or Bluetooth sensor should be fine on the rear wheel. Other wireless computers will have issues.
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