Here's a bit about what I do in a fit. Again, everyone is different in their approach, but you asked what they heck a fitter does for $150 so here's my answer.
First, I take an extensive set of measurements of your bike in it's current set-up. This is our baseline.
Then, I set your bike up on the CompuTrainer. This is a trainer that interfaces with my PC.
Then, I take a look at your feet, shoes, and cleat positioning. I also check your flexibility and measure your shoulders.
Then, I have you ride for about 15 minutes. During that time, I give feedback on what I see (including suggestions for how to improve your technique). I also observe the computrainer output. I use a rolling hills type course with my clients, so I can observe the way they use their muscles in a variety of terrain (uphill, downhill, flats). I analyze your overall efficiency and your power output. I analyze the balance between left and right leg. And I analyze how you recruit and utilize the various muscles within your pedal stroke. And I give you feedback about this.
Then, I take a set of measurements of you on the bike.
I may make changes to your fit immediately (saddle height, saddle fore/aft, bar angle, stem, shim levers). Or I may suggest changes you can make later (bar width, stem length and angle).
I also have a saddle demo program through Specialized, so if you're not happy with your saddle, I can measure you and set you up with the saddle that best meets your needs based on body type and riding style.
And we talk a lot. I interview you about your riding history, health history, injuries (past and present), surgeries, work environment, riding goals, etc. All of this information helps me understand how to best meet your needs.
I finish up by taking a second set of measurements of your bike (reflecting any changes we made). You go home with the measurements along with a list of specific recommendations for component changes and technique drills to improve your riding.



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