Question about Garmin Edge 305 GPS Receiver

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Garmin Edge 305/GSC10 Cadence and speed sensor

I cannot get the cadence and speed to register off of the GSC10 sensor. I have taken the obvious step of replacing the battery and the green and red sensor lights do come on when I reset them and they come on when the magnets pass over them but no reading on the Edge from the sensor--I do get speed reading/calculaton from the gps.

Any ideas?

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  • Anonymous Mar 02, 2008

    Same proble...magnets working, fresh batteries. Speed and heart rate register correctly - no cadence. I had it for several months - now zip. Suggestions?

  • triguy Mar 11, 2008

    Similar problem with cadence registering but no distance/speed from the sensor to my Forerunner 305.  Took all the same obvious steps.  When reseting the red and green lights blink but I'm not getting the green light when the wheel magnet passes the sensor.  The sensor is however "clicking", so it seems there's good magnet triggering of the contact switch.  Go figure...its too expensive to be having these problems.  

  • Anonymous Apr 15, 2008

    I called Customer service about an hour ago. The guy on the phone told me to try to reset the unit a few more times. I'm not sure what that will do. I think their sensor doesn't last very long. I've had mine about 2 years and a friend of mine got his about 2 or 3 months before I got mine and he's having the same issue with the cadence. I'll probably spend the $60 for a new sensor. I'm sure that will solve the issue.

  • Anonymous May 14, 2008

    I am having the same exact issue, red and green light come on, but no Cadence or speed.

  • Anonymous Jun 16, 2008

    I'm having the exact same problem on a brand new unit. Reset button gives the initial flashes but it see the wheel magnet or cadence sensor.

  • themachine90 Jun 19, 2008

    I'm having the simular problem except that every function works except the cadence. It was working but, the readings were erratic, 'til finally it stopped working entirely. I changed the battery & reset it....still nothing.

  • ahamel Aug 13, 2008

    I'm having the simular problem except that every function works except the cadence. I tried the veloshelly solution. It does not solve the problem. Red LED blinks every time the crank arm passes, but no cadence readings on Edge 305 despite the fact I restart scan as suggested by veloshelly.

  • Anonymous Dec 05, 2008

    I have the same problem I know this is an older thread but I did not see any other solution to this other then buying a new sensor(GSC 10).

  • tkeery Jan 06, 2009

    Ditto - done the whole deal - still no reading. What does Garmin say?

  • guillo25 Jan 26, 2009

    I have no idea how to get my garmin 305 edge to read the cadence sensor. Help!!

  • Anonymous Feb 19, 2009

    this garmin is stupid, 500 bucks. two new sensor batteries (HR and Cadence) and i've had only a month and now the speed stops working, cadence still works though. tryed new battery, reset sensor restart scan tc etc. i can't believe ive had so many problems with something that cost me 500 dollars, and thats the cheapest, i could have bought it for 700+.

  • vikingstarvi Mar 31, 2009

    I have a Trice recumbent trike 2 wheels in the front and 1 in the rear. How do I set-up the sensors for the unit to be able to use the sensors?

  • fcedotal Apr 03, 2009

    My cadence quit working and I have tried all of the above solutions and it still does not work. I tested the battery and it is putting out 2.933 volts. After reset on the sensing unit, the red light comes on for about 10 cranks and then quits coming on. I put the Edge 6 inches from the sensing unit and it still does not work. I reset both the sensing unit and the Edge and still no cadence. I tried bike 2 profile and still no results. Edge and sensing unit are 16 months old. Heart rate and GPS function still works fine.

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Had the same problem. Here is how I fixed it.
1. Changed the battery in the cadence sensor. (GSC10)
2. Turned on my garmin 305 edge outside to acquire satellites (probably not nec but did it anyway)
3. Pressed reset on the GSC10, saw red/green flash (what order?)
4. Here's the missing step: On the Edge unit, go to SYSTEM.
5. Scroll to bottom, choose ACCESSORIES.
6. On acc. page, go to bottom, under Cadence Sensor, to the option RESTART SCAN. Press That. Now your cadence and speed should work.

Posted on Jul 07, 2008

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I had the same problem. I needed to move the GSC10 as close to the crank sensor as possible, then I tilted the GSC10 slightly towards the crank. This is the only way I can get it to track cadence, but it now indeed works. I simply don't use the spoke sensor as my speed is calculated by the GPS function, and my spokes are too wide to be able to use it anyway as far up the spokes as would be necessary.

Posted on Sep 25, 2008

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Hi, I'm not sure whether this will solve your problem, but I had the same issue and it got solved by selecting a different bike profile. I switched to Bike Profile 2 in the settings and now my cadence and speed come up fine. Only when you download your data to your computer you need to set it back to bike profile 1 because otherwise the transfer doesn't work. Go figure. Hope it works. GM

Posted on Jan 07, 2009

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This is for the recumbent problem. I have one also and tried to use two GSC-10 sensors - one for speed and one for cadence. The problem is that the Edge 305 sees two cadence sensors and essentially gorps out. You have two choices: 1. Install the GSC-10 so it picks up the cadence, but does not sense the speed. Let the GPS take care of the speed. This should be OK so long as the Edge can see the sky. If you're in a forested area you're going to have problems. 2. Open up the GSC-10 and solder some longer wires between the GSC-10 and the speed sensor arm. This could be tricky.
I'm going to try the first option and also try to figure out how to open up the GSC-10.
If I can work this I'll post the solution.

Fenton

Posted on Aug 13, 2009

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Thanks to Aschwerin for posting the solution to the cadence sensor problem. It worked for me. As he/she mentioned, if you move the GSC10 unit closer to the crank arm, your sensor will be too far away from the spoke magnet to register speed data. However, there is a small screw at the base of the sensor arm that you can use move the arm closer or farther from the wheel, in order to get both cadence and speed at the same time. The GPS does calculate speed independently anyway when you're outdoors, but the speed data may be useful when your riding indoors on a trainer.

Posted on Mar 20, 2009

  • SohailRauf Jul 10, 2011

    Had a similar issue, certainly after cranks were changed and I had 172.5 mm fitted from 170.0mm trust me doesn't sound a lot but the mechanic didn't know the set up. I struggled for a while read your forum went back and hey presto messed around with alignment and it all works. Make sure you fasten the magnet on the crank and the screw on the wheel otherwise they do move and in mid training that's a pain

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I tried all the solutions but nothing worked, may be somebody else can help me? Rpo

Posted on Jun 14, 2009

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Go to menu _-settings-scroll down to ant+sport-accessories then switch on cadence sensor may need to re-scan if still no lluck make sure all other wireless equipment is off.

Posted on Dec 08, 2008

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