Thanks. Actually, the tip on the MTBR forum was quite helpful, I had not known there was a tandem forum at MTBR. We are thinking of dipping our toe in the mountain tandem waters by putting some knobby tires on our venerable 26" wheeled Burley Rock N' Roll (which is now in urban tandem mode).



Then we figured we'd try it out off road tandeming on the perfectly flat Alviso Slough loop. If we like this, then some rolling hills, and if we like it some more, then get a real mountain tandem, with disc brakes, suspension, etc.