Condensed answer: An Ultegra chain can be integrated into a 105 drivetrain as long as it matches the number of speeds that the bike has. Otherwise, the shifting will be…
Condensed answer: Ultegra rotors can be combined with 105 calipers when the rotors are of the correct size and rely on a mounting mechanism compatible with the hubs of the…
Condensed Answer: If the derailleur and the cassette are designed for the same number of speeds, then in most cases, it's totally acceptable to combine a 105 rear derailleur with…
Basic Knowledge The main source of incompatibility complicating the conversion of a road bike with an Ultegra group set to flat bars are the shifters. Modern bicycles have indexed shifters.…