I measured my 2010 Skate Banana and it looks like it's 4-5 degrees. Though the base seems to not be that "flat" cross-section wise. It's convex. Not sure if it's intentional but when I lean it on the table edge and put a piece of paper there, the base at the edges move away from the paper a little. Try it youself and you can even tape the piece of paper on the table and use a ruler to flush the edges and then draw lines onthe paper. Then use a protractor to measure the lines. If you can see the "flush" easily, tape an LED light to the board below the table and then you can see easier at what angle your (opaque) ruler flushes the edge. A steel ruler is best because it doesn't deform like plastic when you press it hard on the snowbaord edge.