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Ok so all the obvious causes are eliminated. Couple more options for you:
- the problem is related to the volume of moist air trapped inside the cover. In theory if there's no ground evaporation and little or no moisture inside the parka then there's little moisture to condense. Possible solution: Pull the drawstring as tight as you can to seal the air - you don't want air exchange overnight. Then try a rechargeable mini humidifier inside the parka.
- Switch out to a breathable cover with material like this. Needs some research as I think you'll have to make it yourself but they do work in everything but really heavy rain.
I'd be interested in your results
- the problem is related to the volume of moist air trapped inside the cover. In theory if there's no ground evaporation and little or no moisture inside the parka then there's little moisture to condense. Possible solution: Pull the drawstring as tight as you can to seal the air - you don't want air exchange overnight. Then try a rechargeable mini humidifier inside the parka.
freddo
The bike is always dry. I can store it in the covered laneway for a bit if it's wet so it air dries, and then I would towel it off before putting it under the parka.
The ground is paving slabs and the bike is tethered to a sheffield 2x toast rack. It doesn't seem to matter whether it is dry or not underneath the bike... the moisture still finds its way into the parka.
I have tried slackening the drawstrings a bit but it's very difficult to find a balance between having "flappability" and not having it trailing on the ground (which I've been told is also a no-no for keeping it dry underneath).
Still laughing at this one...!
The bike is as near as the house as I can do it, without blocking access to the other bikes. And it's in the spot where it gets the most sun - the previous parka had noticeably changed colour after the summer months.
It's pretty frustrating. I've checked it this morning, same thing again, even though there was no rain last night and the ground is dry... a slimy layer of condensation all under the parka.