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  1. #1
    Join Date
    Apr 2011

    Question Help - Cadence Counter Crank Magnet

    Hi all - my first post here. I have a question, and suspect it's been addressed and I am not looking in the right place. I have a Garmin Edge 305 with cadence counter. Lost the cadence magnet, but have ordered a new one. The problem I am having is that the crank arms on my bike are hollowed out/curved on the inside, and as a result, I haven't been able to mount the magnet close enough for it to be read by the cadence counter. It also doesn't fit tightly, which is why it got lost in the first place. Any suggestions? I've been reading quite a few of the posts on saddles and finding them very helpful. Thank you for all the information.

  2. #2
    Join Date
    Apr 2006
    where the wind comes sweeping down the plain
    I have the same problem, actually! When I had my other bike, it didn't have the hollowed out cranks on the inside and it wasn't a problem. When I built this bike, I didn't even think of that being an issue... until I went to attach the magnet. Doh!
    I don't know a solution. I thought about putting a piece of hard foam on the inside to take up the hollow place and zip-tie'ing it in place. Although I'm finding I don't even miss it (not like I thought I would).

    I'm sure someone will have a good suggestion!
    Check out my running blog: www.turtlepacing.blogspot.com

    Cervelo P2C (tri bike)
    Bianchi Eros (commuter/touring road bike)

    1983 Motobecane mixte (commuter/errand bike)
    Cannondale F5 mountain bike

  3. #3
    Join Date
    Jul 2008
    Chicago suburbs
    I have a Garmin Edge 500. My crank (FSA SLK Carbon) also has curved arms. The crank magnet that came with my 500, has an adhesive backing to it helping it stick to the crank arm. Once I figured out where I wanted to position it, I peeled off the tape and stuck it on then secured it with the included zip tie. Mine seems to be staying put, although it has only been about 3 weeks since I put it on...so we'll see. If your magnet didn't come with an adhesive backing, then I suggest some double-sided tape to stick on the backside of the magnet to help adhere it to the crank arm. I also positioned my magnet closest to the pedal, which also happens to be the flattest part of the arm...so that may help too.
    2012 Seven Axiom SL - Specialized Ruby SL 155

  4. #4
    Join Date
    Aug 2006
    Melbourne Oz
    I use a small rare earth magnet which fits over the crank key hole. Couple of dollars; no sticky, definitely no zip tie!

  5. #5
    Join Date
    Feb 2010
    Taylor, MI
    Not particularly attractive, but electrical tape works to hold the magnet and it still works. The tape comes in assorted colors..

    2018 Trek Silque SLR6 - Selle SMP Glider
    2018 Specialized Dolce EVO Comp - Selle SMP Glider
    2011 Trek Madone 5.2 WSD -Selle SMP Glider
    2013 Giant TCX W - Oura 143

  6. #6
    Join Date
    May 2010
    New Hampshire
    I have the Garmin 500 with the cadence and my magnet stays on but I can't for the life of me get it to actually read.
    2005? Storck Senario cd 1.0 with SRAM Force, Specialized Romin Comp Gel 155 saddle
    1998 Lemond Tourmalet
    2007 Gary Fisher HKEK

  7. #7
    Join Date
    Apr 2006
    Quote Originally Posted by oz rider View Post
    I use a small rare earth magnet which fits over the crank key hole. Couple of dollars; no sticky, definitely no zip tie!
    me, too, since +1 isn't long enough.
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    I will never buy another bike!



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