Hmmm. Caked mud on tires sounds more like a tire selection issue than a rim issue. I used to use WTB Weirwolves with reasonable results in general but found them to be lacking for muddy trail riding and absolutely brutal for muddy DH, especially the clay variety. Lots of understeering and rear wheel slippage in turns. To be honest, there are no miracles - not much will save your a$$ in saturated clay other than a solid line and hands off the brakes. For what it's worth, a number of top-rated freeride and DH pros go with Maxxis High Rollers and Minion DH for crazy muddy riding North Shore style - steep and muddy. I've got them on my DH bike and have used them on my Heckler in super-gnarly conditions with better results than otherwise expected. They're a safe bet.WeylessXPRider said:I'd think it'd be necessary over here in Japan, the trails here can get treacherous from time to time, especially after it's rained, the clay get really slick , like today it had rained like 2 days ago and my tires were getting completely caked with mud, and the trail that I rode was pretty difficult, I was sliding everywhere, I guess the fact that I'm using comp versions of WTB tires wasn't helping very much .