Hi , I have a model 5 taildragger with 600x6 mains. I am switching my current Lang 6" solid rubber tailwheel to an 8" pneumatic . I am thinking of going to a bigger size on my main wheels ,I was thinking of 800x6 's or 700x6's . My question is how much higher do these "stand" from the ground to top of tire? or from the ground to axle? What does the 800x6 mean, how is it measured? I know its a 6" rim , but the 800 I don't get .I am not planning on any extreme backcountry landings just my semi smooth grass farm strip and occassional pavement. Thoughts?