I should have looked more closely (the bronze logo threw me). I have both and yes, the 7400 is square and the 7700 is Octalink (1 not 2). The 7400 has the logo square etched in while the 7700 is printed so not sure what is going on with that left crank arm. Track?
I should have looked more closely (the bronze logo threw me). I have both and yes, the 7400 is square and the 7700 is Octalink (1 not 2). The 7400 has the logo square etched in while the 7700 is printed so not sure what is going on with that left crank arm. Track?