Most MX bikes now come with rubber mounted risers. I see that the rubber pieces are different between brands. Are some brands softer/ more flexible than others? Also are some more compact? I want to put rubber mounted bars on a trials bike and am planning to make a top triple clamp. I want flexibility so am wondering which one would be best to copy. I could then buy a top clamp and copy the mounting geometry. Could the geometry be on the net somewhere.