Soma Cazadero Tires - Various sizes
These are our favorite mixed terrain tires and are a perfect choice if your rides have a good portion of both road and trail sections. Cazaderos have a smooth center tread so there's minimal buzz on the road but they do have some side lugs so cornering on dirt isn't a total gamble. These are the lighter Panaracer sidewalls, but we're going to get them eventually with the brown, more durable Shikoro sidewall. I (Will) have used the 42mm version and wouldn't hesitate to do an all-road ride on them either; They feel great.
Only available in 42 and 50mm for now.
For Rivs we recommmend:
Sams n Homers - 42mm
Atlantis, Appaloosa, Clems, and Platypi - 50mm
Susie/Gus- 50mm will work but you'll be at the skinny end of what the frames are designed for, so don't pedal thru corners.