Another thing to consider is crawl speed. When I went from 1100x20 (measured 42") Goodyears on my Rockwelled M715 (Velvet) to 395/85 XML's my crawling speed increased a LOT. May not matter to a strictly road guy but if you're slow go or on trails...expect a speed increase. A low idle didn't have the power to pull you over objects like it had with the 42's. I adjusted my choke cable so that it would tip the throttle butterflies a bit ahead of the choke blade so I could use it to increase my idle so I wouldn't be struggling trying to drive all two feet on three pedals. It still got a bit bumpy as you'd carry more speed up a rock and drop hard on the other side...
