2001 Klein Quantum – 57cm Aluminum Road Bike | Shimano 105 | Classic Performance

The Klein Quantum is a legendary American-made road bike known for its beautifully crafted aluminum frames and razor-sharp handling. This 57cm size fits riders approximately 5'10" to 6'1", and it's ready for long-distance rides, training days, or spirited weekend spins.

Built in 2001, this Quantum blends a lightweight aluminum frame with a carbon fork, offering the perfect mix of stiffness and comfort. Outfitted with a reliable Shimano 105/Tiagra 3x9 drivetrain, this bike delivers smooth shifting across a wide g...