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Old 07-20-04, 08:33 PM   #1
Moistfly
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Cadence sensor mounting

So i'm trying to install my cadence sensor, easy enough, the problem is, the magnet that mounts to the crank attaches with a flat strip of adhesive, but my crank is concave on the chainstay side and quite curved. Just wondering what the best method of attachment is going to be? I was thinking epoxy but will that bind well enough to carbon fibre? It seems like it ought to but i'm not an expert and want to make sure I do it right the first time.
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Old 07-21-04, 05:31 AM   #2
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I had to use plastic ties and a good brand of electrical tape on mine. I replace the tape about once a year. I also had to put a thick-walled section of plastic tubing on my chainstay to get the pick-up close enough to the magnet. The only problem with Epoxy is that you may have to destroy the magnet and damage the finish of the crank to remove it. Actually, you should sand both bonding surfaces (then clean with Acetone) to use Epoxy, so you'll dull the finish anyhow.

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Old 07-21-04, 02:43 PM   #3
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The Cateye magnet has a gap for the plastic tie to threat thru. The pastic tie secures mine quite well.
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Old 07-21-04, 08:23 PM   #4
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I forgot to comment on the carbon fiber/Epoxy bonding. I know that carbon fiber canoes are made with Epoxy. I would think that carbon fiber bikes are too, but I don't really know. If it is made with Epoxy, then Epoxy will bond very well with cured or hardened Epoxy. If not, there's still a 90% chance you'll get a good mechanical bond if you roughen the surfaces with like 60 grit sandpaper.

There are different formulations of Epoxy. The faster curing versions, like you find in the double tubes, give a much weaker bond than the slower curing types like West System. The stuff is expensive.

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Old 07-22-04, 07:00 AM   #5
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Quote:
Originally Posted by Moistfly
So i'm trying to install my cadence sensor, easy enough, the problem is, the magnet that mounts to the crank attaches with a flat strip of adhesive, but my crank is concave on the chainstay side and quite curved. Just wondering what the best method of attachment is going to be? I was thinking epoxy but will that bind well enough to carbon fibre? It seems like it ought to but i'm not an expert and want to make sure I do it right the first time.
Iused a zip tie that came with my magnet, but the magnet still slid down from time to time, so I put a small dab of slicone on the back of the magnet. I have aluminum cranks.

edit: Sorry about the run-on sentence.
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Old 07-22-04, 11:19 AM   #6
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Thanks for the input guys. I really appreciate it
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