Douglas Matrix Carbon Road Bike 55cm 700c Ultegra 1 of 2Freshly serviced Douglas Matrix carbon fiber road bike. This bike is made up of a carbon frame, fork, and FSA seatpost. It has Easton Circuit wheels, Shimano Ultegra drivetrain, and comes with a fresh wrapping of bar tape. The sizing on this bike is 54cm top tube and 55cm seat tube; center of bb to top of seat tube. This is a great quality carbon road bike for a great price. This bike is a match to another Douglas Matrix we have of the same size.