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Planet Bike Protege wired computer
 Redsfan member offline
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posted 8/13/2019
at 8:24:15 AM
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I have been using Planet Bike wired computers for many years. I switched to them more than 10 years ago from the Planet Bike wireless version when I started encountering some electrical interference that would make my cycle computer think I was going over 80 mph at a few very specific points on my commuting route.

Anyway, I generally like the computers even over my newer Garmin GPS cycle computers for urban riding because they handle frequent stops and starts more reliably. However, they have one flaw that bugs me; they don't work in the rain. Inevitably, if I ride in the rain (even a fairly light rain) for more than 10 minutes some water gets into the mount for the head unit and shorts out the contacts causing the cycle computer to stop working. Planet Bike mounting bracket

I am looking for a solution to keep the cycle computer working in the rain. I think I tried putting some plastic wrap over the computer as a kind of raincoat but I don't think that kept the water out sufficiently.
thread edited on 8/13/2019 at 8:25:06 AM

 vkan member not displaying online status
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posted 8/13/2019
at 2:35:47 PM
post #1 viewed 481 times
Are any of the three rectangular depressions through to the bottom so that they should act as a drain for water? If not, maybe drill holes? I guess there's risk that there may be electrical connections in the plastic that you might end up breaking.

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posted 8/14/2019
at 6:52:02 AM
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The depressions don't go through. I don't think drain holes would help because the contact area seems to only need to be a little bit damp so even if water drained the problem would still persist.

What I think would work is a really tiny shower cap. I might have to search for a prophylactic with absolutely no stuff inside it and completely clear.

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posted 8/14/2019
at 7:14:42 AM
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I like wired bike computers too. I use a Cateye Mity 8, which likely shares a lot of the same features and components of the Planet Bike. I suggest removing the computer from the mounting base. Clean the little contacts between the base mount and the computer real well. Put a little bit of battery terminal grease on the contact points and reinstall the bike computer. The battery terminal grease is the same stuff sold in a tube at any auto parts store. It will help seal out the water, and prevent corrosion on the contact points.

 Redsfan member offline
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posted 8/14/2019
at 10:38:49 AM
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I will try the battery terminal grease. It sounds better than the rubber product idea.

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posted 8/14/2019
at 12:16:30 PM
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I will try the battery terminal grease. It sounds better than the rubber product idea.
-- posted by Redsfan
Or silicone electrical conductivity grease. Should be similar.

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posted 8/14/2019
at 1:10:32 PM
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My Cateye wired computer will quit when it really gets soaked.I try to put it in a dry place if I think its really going to pour down.I might look for some of that grease.Where do they sell it at?

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posted 8/14/2019
at 2:58:06 PM
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I found both the dielectric grease and silicone conductive grease on Amazon but I would bet it is at auto parts stores and maybe even big box stores that sell automotive stuff. Personally, I am asking my son who is quitting his job as a truck mechanic tomorrow if he has any he can give me.

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posted 8/17/2019
at 7:33:59 AM
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Grease. I think the specific stuff is dielectric? Other commenters are on the money!

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posted 8/17/2019
at 9:48:49 AM
post #9 viewed 413 times
My son did have some and I applied it to one of the mounts. It hasn't rained while I was riding that bike but I will test with a spray bottle later.

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posted 8/19/2019
at 12:19:13 PM
post #10 viewed 401 times
I use a VDO M5 wireless computer and just got back from a weekend tour that had heavy rain at times. What I found worked well was to cut a piece of clear, medium-heavy plastic* and secure it around the computer with a rubber band. I had no problems that way.

*If you're Canadian, it was a section of an old milk bag.
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