That 168cm is only a rough estimate. For a lowracer, the measurement that really matters is your inseam. Unfortunately, I don't know the minimum inseam or if that number includes things you can do to alter it further. For instance, if you are only a few cm too short, you can use shorter crank arms. Your best option would be a test-sit on one. Second-best would be to call them. Be ready with your measurements.