stands capacity

That is what I expected. But nevertheless I would mention it in the wiki because at the beginning (without thinking) I only counted the number of stands. Any objections?

But the wiki page already says capacity=The number of bikes that can be parked here.

That's correct but as I wrote before if you don't ride a bike or don't think about it you might only count the stands. That's not so utopic and I did it. I don't say such a comment ("consider that perhaps a stand can hold more than just one bike") is mandatory but it could avoid dummies like me from counting in a wrong way ;-)

People who don't cycle are unlikely to map cycle parking at all. If they do then they are still unlikely to consider capacity (in much the same way as drivers don't often map car park capacity). When they start, they are likely to read up on the tag (I would like to think).

I recently got into an e-mail discussion on exactly this point with another mapper. He said that the capacity of a bicycle parking facility is the number of bicycles that can be parked there (obvious really, but I had been getting it wrong). He also pointed out that the most important thing is to show where there is bicycle parking. As with car parking, if you are unsure about the capacity, leave it unset. The map entry is still useful, and probably someone else will fill in the missing details later.