The felt fr2 disc built with a selection of advanced componentry like a shimano ultegra di2 electronic drivetrain as well as carbon dt swiss fc1600 wheels the fr2 disc also features the latest standard in road bike technology disc brakes for optimal control in any conditions shimano ultegra di2 drivetrain with the same electronic shifting technology used on shimanorsquos top of the line dura ace groupset and only a minor weight penalty over its more expensive sibling it is no wonder the