I too use a 10 speed chain and run a Campy Record drivetrain on our Tandem. Never had an issue with wear or breaks. We live on a 14% hill and have to ride that thing up after all of our rides. [It is sure fun coming down on the begining of every ride]. We did break a rear freehub going up one time. Sucks but we did not crash even though we were going 5mph up the 14% grade.