Dave is fantastic. If you live anywhere near Orange County, and you need a bike fitting, I wouldn't consider anyone else. He takes careful measurements like sit bone width (using a pressure sensitive pad you sit on), pedal stroke (using a plumb bob), and a host of other metrics and lets you come back as many times are needed to dial in fit. He is very responsive to emails and the difference in my efficiency and lack of pain while riding long distances is noticeable. He has great advice for training and nutrition as well, and the bazillions of jerseys signed by the many racers he has coached attest to his experience. But please note: I am a 58 year-old non-racer who got into cycling on 1/1/21, so he can help mere mortals a lot as well. I can't recommend him enough!