We are currently testing a prototype carbon fiber eccentric on our tandem.
It is lighter and has a very simple one bolt adjusting mechanism. Currently 3 of them are, or soon will be, on test tandems.
Test results will determine whether eccentric will go on the market. Designed/built by Bob Davis at ariZona Tandems.com
Pedal on TWOgether!
Rudy and Kay (test dummies)