For someone with bad knees, would the zeros or X2's be better? I would think the extra float wouldn't be noticed on the X2's but I could be wrong.

Also, I think I read somewhere that the X2's are structurally a lot different than the X5's, and they cost a lot more. With the Zeros though, the chromoly pedals seem structurally the same as the stainless steels ones, so cost-wise I think I would prefer to get the Zeros.

Thanks