Garmin cadence: only works stationary ..?

[sage]

Hello,

I have a Forerunner 405, and just bought the GSC10 cadence/speed sensor this week.

Installed and adjusted it just fine using the button to show up the red/green flashes for speed and cadence.

Paired it with the FR405, and it is picked up and shown.

Took off on a ride, and after a little the Auto speed setting showed that the calibration for the wheel size had been determined - BUT, cadence was zero or with very spiked readings..

 

Tried re-adjusting etc etc, turned off all other sensors (HR, Speed magnet) to no avail thinking that perhaps it was interference.

Then, just pedaled the bike dismounted, with the rear wheel lifted - works perfectly!

Get on the bike and ride - problem returns.

 

I'm out of ideas, anyone had this happen to them??

 

 

 

 

[leet22]

Only thing i can think of is the sensor is moving out of line.

[sage]

You mean from the vibration of the ride?

I've got them pull-ties as tight as they could go...but I could try re-seat the whole thing.

 

As it is, I just read here on the Hub that there's a small hole under the rubber foot that needs to be doctored to make the unit water-proof..

 

[Guest Agteros]

 

Hello' date='

I have a Forerunner 405, and just bought the GSC10 cadence/speed sensor this week.

Installed and adjusted it just fine using the button to show up the red/green flashes for speed and cadence.

Paired it with the FR405, and it is picked up and shown.

Took off on a ride, and after a little the Auto speed setting showed that the calibration for the wheel size had been determined - BUT, cadence was zero or with very spiked readings..

 

Tried re-adjusting etc etc, turned off all other sensors (HR, Speed magnet) to no avail thinking that perhaps it was interference.

Then, just pedaled the bike dismounted, with the rear wheel lifted - works perfectly!

Get on the bike and ride - problem returns.

 

I'm out of ideas, anyone had this happen to them??

 

 

[/quote']

 

Forerunner? Or Edge? Coz my FR does not have a colour screen....

 

Did the magnet not move/swivel on the spoke?

 

[NotSoBigBen]

Oi behind ox the oke speaks of the LED on the cadence sensor that changes from green to red not the screen!

[Guest Agteros]

ahah so the thick plottens

 

[sage]

It's still doing it, even after re-seating...I'm thinking that there must be a loose component or slightly dry solder joint inside on the circuit board that vibrates and kills the signal it gives off.

 

Will return it rather.

 

[ChrisH]

What kind of bike is it?

 

If it's a dual suss MTB chances are the bobbing action at the rear is taking the cadence meter a little away from the magnet on the crank.

 

I could never get it to work on my MTB but works 100% on the road bike.

[sage]

Thanks Chris, I'll check that out - yes, the bike is a softtail..but the suspension is stiff and I had this issue on a smooth flat road even. Also, the sensor is very near the hinge, so travel there is quite small - I'd have thought the sensor could cope with a few mm movement as it really just needs the magnetic field to alternate over it.

The unit is being replaced by Garmin, so I'll see how the "new" one fares!