I've talked this tire up a ton, but I love it....Bontrager XDX. High volume, fast rolling, and great traction. They look like an SB8 but with larger knobs further spaced apart. Downsides are the compound is fairly soft (wear quickly) and they are discontinued. I'm giving the 29-3 TLR (2.25 size) a shot this weekend. Tread pattern is pretty aggressive and they supposedly roll pretty fast.