Dirtdame, where is the 501 doing the twitchy thing, deep sand, high speed pavement?
Low speed, tight singletrack. Also seems to climb the side of ruts. Not my favorite on hard, slicky dg either. It is a 90/90. I was running an IRC Battle Rally up front before, but changed it out because it wasn't sticking turns in the sand very well, but I really like that tire better in rocks and gravel. It's a very ho-hum looking 50/50 tire that performs very nicely in lots of different terrain and on the street as well. Good feedback and feel in tight going. I will probably return to that tire. I haven't had the Golden Tyre on pavement yet, but can imagine that with the tall flexy knobs, it's not going to feel very solid there.