HI, hope someone can help me? I have been searching for a new bike and after much searching it has come down to a Cannondale Synapse Carbon Ultegra or a Cervelo R3 (frame). Im looking for a bike weight of about 15lb which the Cervelo would be,(with the right equipment), but the Cannondale comes in at 17lb. I know that replacing the wheels with something like the Mavic R-SYS would shave several ounces, but having a hard time trying to find the proper advise. Im looking for a bike that would be comfortable for 100 mile sportives, and tours, but would not be a slouch when pushed... Can anyone help me???