Chris516

Is it possible to replace the magnet? I have a feeling that I accidentally removed it. Thinking it was part of my Blackburn Delphi 6.0 that I no longer use.

a1penguin

Let me google that for you

I like the new style cadence sensor that attaches to the crank.

Chris516

I agree.

Looigi

We commonly use a 3x12mm rare earth magnet (craft store, amazon, ebay...) that sticks to inside end of the pedal spindle to trip the GSC10 cadence sensor. It can also be glued, stuck with double stick mounting tape, or taped in place on the inside of the crank arm.

Agree that new accelerometer based magnet-less individual cadence and wheel sensors are very slick, but they're a lot more expensive than a magnet.

KenshiBiker

+1

I use a rare earth magnet (maybe two, I can't remember) stuck to the pedal spindle - don't even have to use tape since my pedals have steel spindles. Works well, and you can't even tell it's there (unless you're looking for it).

ModeratedUser17082018

I used a rare earth magnet directly on my pedal spindle and it works really well and it is out of sight. However, I don't know how I'd remove it since it now sits inside the spindle "well" and no obvious means of pulling it out should the need arise. Maybe a bigger magnet? Epoxy a bolt head?

They make one with a hole in the middle - that would give you the means to pull it back out if necessary.

Looigi

Next time, first put square of electrical tape on the inside of the crank arm over the end of the spindle then place the magnet on it. You can pull the tape off the remove the magnet. Another options is to fold a piece of tape over the magnet leaving a tab where the tape contacts itself and use the tab to lift off the magnet.

For now, my guess is you'll be able to pry it out using a thin blade, like a knife point or exacto knife. If your pedals remove via flats on the pedal side of the crank rather than a hex recess on the end of the pedal spindle, just remove the pedal.

ModeratedUser17082018

Thanks for the advice Looigi. These magnets are strong. I was holding it close to the spindle to see if it would fit when it jumped out of my fingers and directly into the hole on the back of the crank and attached itself inside the pedal spindle hole. It fit perfectly but I immediately realized that getting it out again would be a challenge. The Ergon pedals don't have flats on the outside for a wrench and the magnet covers the hex head on the inside.

Since there's no space for a slim or pointy tool to pry the magnet out, I think I'll try another magnet first if I ever have to remove the pedals.

The upside of these magnets is that you don't have to adjust the sensor very close to the magnet. My post was mostly as a warning to others to use the magnet with a hole to avoid my mistake!

Looigi

Yeah. It depends on the pedal and crank arm too. For some combinations like yours, the end of the spindle is recessed pretty far in the crank. In others, the end of the spindle is flush with the inside surface of the crank arm. I have both situations on different bikes...and on yet another bike I have pedals with Ti spindles that don't attract the magnet. Tape works in all these cases.

ModeratedUser17082018

Next time I'll use tape! Thanks for the suggestion Looigi.

A bigger magnet might pull it out of the spindle well. If that doesn't work I'll try to epoxy something to the magnet. If that doesn't work, I'll try to drill a hole and then use a small hook to pull it out. Until it's a problem, it's not a problem.

I mostly wanted to warn others, and to say how well the rare earth magnets work. I even added one to the spoke magnet that triggers the speed sensor. With the rare earth magnets, the adjustment tolerances are very wide and easy to set. I don't know why these sensors don't come with rare earth magnets standard.

For those that want to use a rare earth magnet on their spindle, buy the kind that has a hole in the center so you can pull it back out if necessary.

Shimagnolo

Easiest way to pull a magnet off the end of the spindle is to give the magnet a more massive piece of steel to grab.
I usually use the side of a crescent wrench.

ModeratedUser17082018

Thanks Shimagnolo - an excellent suggestion and easier than epoxy or drilling. I'll have to give it a try.

Despite my mistake in allowing the magnet to jump into the spindle well, I really like the wide tolerance it provides. I added a rare earth magnet to my spoke magnet too.