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@olaf_von_pokemon
^ I'm not sure about your GI as that sounds prety low - but everyone is different.
I did my knees in running - mal tracking patella - so switched back to the bike.
For years now I've not had any probs on the bike but recently my knees started to hurt.
This coincided with a change in saddle position following a broken seat post. Not long after the change they started hurting. I fiddled about with the position but it didn't really help. In the end I dropped the GI by about 12 to 70GI and difference was amazing. All of a sudden the knees are fine and I'm having fun doing a lot of spinning. It seems odd though that this has made the differenec as I was runnign the bigger gear for a year with no probs.
The only disadvantage is that I can no longer go as fast - I spin out about 45kmph/140+ rpm. This means I can no longer keep up with some of the geared riders who only need to switch up a gear or four to pull away.