Serotta fitter's have a prototype bike called a sizecycle. After they determine your measurements they set up the sizecycle to let you feel how different the changes are that you need.
I had my Aegis refitted by a Serotta fitter because I was having shoulder pain. It turned out that my handlebars were 4cm to low. To make changes it required a new fork. I wasn't convinced that 4 cm would make much of a difference until I felt it on the size cycle. I then took the bike to the shop that does my mechanical work. They ordered the fork for me and installed it.
When I ordered my custom Serotta the setup of my old bike was used as a starting point. The sizecycle was hooked up to a computer and I pedaled for approx. 1/2 hr before the fitter looked at anything. Then he made some minor adjustments. I was injured so my leg strength wasn't very good so I never asked what results the computer showed.
Be sure you know what it is about your bikes that feel good and what it is you don't like, what kind of riding you do etc. Be honest when they interview you. My orginal Serotta fitter checked my flexiblity. Also, if you need a new stem, etc. and the shop installs it you will pay for parts and labor.
After the fitting, have the shop give you a sheet with your measurements. That way, if anything gets moved, saddle, etc. you can have it set back where it belongs.
Here's a picture of me on my custom Serotta. I love the fit of this bike!



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