DIY Computrainer Puck Cadence Sensor?

I have a computrainer that I’ve been using for a while without the cadence sensor. I have the sensor, but there’s no clearance betweent he crank arms and bike frame to fit the sensor/magnet. I was thinking of getting the “puck” but jeez $150?! I can think of a few ways to do a DIY project here but what have you guys done instead of the puck?
I read somewhere on the forum that someone did a “reticulating arm” under the bike with the sensor attached, but I couldn’t find that.

Anyways, any advice is appreciated… I’m ready to get a cadence reading now :slight_smile:

I have a computrainer that I’ve been using for a while without the cadence sensor. I have the sensor, but there’s no clearance betweent he crank arms and bike frame to fit the sensor/magnet. I was thinking of getting the “puck” but jeez $150?! I can think of a few ways to do a DIY project here but what have you guys done instead of the puck?
I read somewhere on the forum that someone did a “reticulating arm” under the bike with the sensor attached, but I couldn’t find that.

Anyways, any advice is appreciated… I’m ready to get a cadence reading now :slight_smile:

Crank magnet does not need to be on outer crank face. A small rare earth magnet could be placed on crank edge. The sensor’s velcro strap can surely fit somewhere between where the crank passes the frame (on a stay closer to the BB, or another tube).

Depending on which software you use, you can use your bike’s existing ANT+ cadence sensor to provide cadence info.
e.g. PerfPro with an ANT+ stick will do that (will display power, HR and speed data as well from your own devices if you like).

Of course if you don’t have those already, then that’s more than the $150 puck :slight_smile:

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Thank you for the suggestions. Unfortunately I dont have Perfpro :frowning:
I have carbon cranks on my Slice 3, so I dont believe the rare earth magnet will work unless I use some type of adhesive. Any suggestions?

-Ryan

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Well, I was going to suggest getting a crank based power system (the stages would work but you’d have to replace your entire crankset as stages doesn’t work with Carbon). In any case, with crank based power you get cadence as well. With a Ant+ based cadence! you can use CTAnt on your computer with a USB Ant Dongle to get the cadence.

I’ll have to think as to whether I can come up with a more complex method or not. Not sure I can.

But, you may be able to figure out how to put the sensor on your BB and a magnet on your crank - double sided sticky tape to a chainring bolt or something like that.

I use electrical tape. Pretty easy and effective.

Thank you for the suggestions. Unfortunately I dont have Perfpro :frowning:
I have carbon cranks on my Slice 3, so I dont believe the rare earth magnet will work unless I use some type of adhesive. Any suggestions?

-Ryan