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Mounting cadence sensor on irregularly shaped chainstay

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Mounting cadence sensor on irregularly shaped chainstay

Old 09-08-13, 10:56 AM
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Mounting cadence sensor on irregularly shaped chainstay

I've run into a weird issue on my Bianchi Infinito. For whatever reason, the chainstays are highly irregularly shaped. The top comes to a narrow point only 1-2mm wide and about 8mm tall.

I'm trying to mount a cadence sensor, and not really finding a good method. So far the best I've been able to do is mount the sensor upside down and facing backwards. Unfortunately, it seems to have a directional antenna so as soon as the battery drains a little it stop picking up.

I'm debating getting a Garmin, but that would have that same issue. I was wondering how other people cope with the issue.

The easy answer is obviously to just get a Garmin + Stages and solve the whole problem. Now to justify that one with the wife...
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Old 09-08-13, 07:22 PM
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most cadence units, come with some sort of rubber carrier / bracket, that allows it to conform to the shape of the chain stay when you tighten it down with the zip ties
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Old 09-08-13, 07:43 PM
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Originally Posted by kleng
most cadence units, come with some sort of rubber carrier / bracket, that allows it to conform to the shape of the chain stay when you tighten it down with the zip ties
Or maybe you have to get out some medium density foam or rubber and start carving your own.
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Old 09-08-13, 09:26 PM
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Originally Posted by JonnyHK
Or maybe you have to get out some medium density foam or rubber and start carving your own.
Or wrap the stay with tape or something, or wedge out the narrow parts with some kind of shim. Or just throw the sensor away. You can't tell how fast you're pedaling?
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Old 09-08-13, 09:40 PM
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Originally Posted by kleng
most cadence units, come with some sort of rubber carrier / bracket, that allows it to conform to the shape of the chain stay when you tighten it down with the zip ties
Yeah, its not even close to effective. The cadence sensor is about 10mm wide, and the chainstay is 3mm wide.

I've debated the DIY foam solution, I was mainly hoping other people had some tips/tricks for handling this.

And as for telling how fast I'm pedaling, yeah, that doesn't really work at all. I've got no sense of timing, so basically I have no idea how fast I'm pedaling. This way I can actually practice holding higher cadence and see how it works.
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Old 09-08-13, 09:59 PM
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Is the underside of the chainstay wider? If so, mount it upside down.
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Old 09-08-13, 10:16 PM
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Non-issue. Refer to other thread concerning how much better it is for you to ride sans computer. Conform.
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Old 09-08-13, 10:43 PM
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What cadence sensor did you buy? The Garmin comes with two different sizes of rubber mounts but once you tighten the zip ties either of them conform fairly well to the chainstay. If you're having a problem with your current one chances are that the Garmin unit isn't going to be much of a better fit either.
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Old 09-08-13, 10:51 PM
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Buy some of this amazing stuff. It's almost magic.
https://sugru.com/

I posted this in the wrong thread earlier....
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Old 09-09-13, 12:37 AM
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Originally Posted by gsa103
Yeah, its not even close to effective. The cadence sensor is about 10mm wide, and the chainstay is 3mm wide.

I've debated the DIY foam solution, I was mainly hoping other people had some tips/tricks for handling this.

And as for telling how fast I'm pedaling, yeah, that doesn't really work at all. I've got no sense of timing, so basically I have no idea how fast I'm pedaling. This way I can actually practice holding higher cadence and see how it works.
Mount it on the down tube near the BB
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Old 09-09-13, 07:12 AM
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Originally Posted by cccorlew
Buy some of this amazing stuff. It's almost magic.
https://sugru.com/

I posted this in the wrong thread earlier....
Cool stuff...maybe the invention of the century!
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Old 09-09-13, 07:12 PM
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Originally Posted by cccorlew
Buy some of this amazing stuff. It's almost magic.
https://sugru.com/

I posted this in the wrong thread earlier....
I definitely need to look into getting some of that. I forgot all about that stuff, it looks awesome though.
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Old 09-09-13, 11:04 PM
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Without pictures I really can't advise, but two things come immediately to mind:

Buy some double sided tape. It can be as strong as the thin stuff they use to mount trim on cars (3m, available at any auto parts store). That would hold it in place, period. Or maybe the foam stuff that would work to stick and shape to the stay, but you'd need zip ties backing it up probably.

I also have used plain old hot glue to hold speed sensors on forks - it works perfectly, holds very strongly and can be removed with a little heat (hair dryer, e.g.).

I don't think it will be tough to solve - maybe post some pictures?
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