The Shaka bar is our wide, but not super wide "dirt drop" bar. It's a good choice if you're looking to try out a wider drop bar, but don't want to break into the 600mm+ range. It has a short ramp, is relatively shallow, and has a little bit of a flare.
The 31.8 clamp diameter is only available on the 560mm version and the 560mm version only comes in the 31.8 clamp diameter. Very exclusive. No we will not be offering the other widths in 31.8 and we will not be offering 560mm in 26.0.