I've had 4 fits - - two were simple set-up type fits when I purchased a new bike and two were full-on "let's dial this in" fits.
The best advice I can give you:
- Don't let the fitter turn your 3-hour fit into 90 minutes (60 of which is spent measuring flexibility and switching out parts)
- Come prepared with patience
- Come prepared ready to actually ride
- Go to the fit studio BEFORE buying the fit. The outcomes of both my "professional" fits were easily predictable based on the studio after seeing it in person. A website with pictures and a list of services can very easily misrepresent the skill/engagement of the fitter.
My experience is, if you let them, the fitter will put you in a position and ask "How does that feel?" If you say, "Fine", you'll find yourself out the door lickity-split. You need to ride at power and for time to let those uncomfortable points appear. This is also why you need to go prepared to ride and with your patience because you may need to try 3, 4, 5 positions for 10 minutes at a time to realize any differences.
My first fit was on a bike that put me in a hundred different positions for like 10 seconds each. No actual riding under load. I ended up with something that was very much more aggressive than what I went in with but yielded no gains at all during the racing season.
The last fit I had was supposed to be Retul with all kinds of analysis. I drove an hour to get there and when I arrived, the fitter said they weren't going to set up the Retul bike because they really didn't need it and the bike was currently configured for a kid so they needed to make lots of adjustments. Really? That fit was a complete waste of money.
Some fitters list these services (for example):
Physical AssessmentFoot Structure AnalysisCleat & Shoe Analysis (shims and wedges at an additional cost)Initial 3D Motion Capture & Bike Fit AssessmentDynamic Fit AdjustmentsPost-Adjustment 3D Motion Capture w/Video AssessmentPre & Post Monitoring of Pulse and Oxygen SaturationPost-Fit Digital Bike ScanComprehensive Post Fit Report via Email.Dynamic Fit Session includes Fitting at least three effective seat Angles w/Pulse and Oxygen Saturation levels monitoredVideo Capture Utilization Included when indicated If you are going to choose a fitter who sells this stuff, you should ask to see what the final product looks like for an actual fit they've done. The two fits I've had that promised this type of stuff either didn't deliver, delivered something that was just a few dots on a graph, or said these parts weren't working properly that day.
At one of my fits, I was told (at the end of the fit after I was off the bike) that I could switch to 165 cranks from the 172.5 I was riding. When I pushed pros/cons, I got word salad. No additional testing, just "Do what feels good. Give it a try".
I don't mean to bash fitters. I'm just suggesting that before hiring them, you interview them like you would the guy replacing your roof. If they say they will replace the shingles, you have to ask, "What shingles are you replacing and with what brand shingles are you replacing them with? What techniques will you use to remove the old shingles and attach the new ones?"
Get specific with your questions both before and during the fit. If you get lots of bland, generic answers from your prospective fitter, go elsewhere because you are going to a bland, generic fit.