Knee Pain

specialized BG footbeds. they come in red green and blue which are various degrees of arch support. a BG dealer should be able to check your feet to see which one you require (i got the greens because i knew i had high arches) they come with wedges that go under the footbed inside the shoe. specialized shoes come with some varus tilt built in. adding / taking away wedges will get your knees tracking straight but it's easier if you get somebody to look at you on a turbo a BG dealer is obviously the best place to do this.
the footbeds have a 'metatarsal bump' in the middle of the foot which feels odd at first but is very supportive. the sidi's i have now don't have room for the BG footbed so im using the sidi one with the wedges. getting a bit of discomfort as my foot is being pushed flatter without the bump but i guess i'll get used to it.
i may do the same as dommyracer and combine a bg footbed with a cleat wedge to give me more room in the shoe. my shimano shoes have enough room so i'll continue using the BG's in them.

the BG technician who sorted me out now works at sigma. (he's called Nick)

massive thanks for this. I went to condor this morning, blue footbeds fit in my sidi's, using 2mm wedge in the left shoe.