Well, a proper bike fit goes quite a bit further than measurements…
Look at the components of a bike fit… First the interview
(where frankly you end up spending the most time since it is the most important part of the fit
), where the fitter understands YOU; athletic background, cycling background, current goals, future goals, distances you train/race, terrain, current/prior injuries/issues, etc. etc. etc. The more information you can give, the better the fit will be.
The you have the strength and flexibility part, where core strength, strength of certain muscle groups, muscle balance, flexibility of joints and muscles are measured.
After that, you get to the body measurement, upper/lower body, upper leg/lower leg, arm, torso, and most important, discrepancies between left/right side of any measurement.
After which comes the dynamic fit, where you spend time on the bike or on a fit bike, looking for body movement and efficiency.
Commonly a bike fitting sessions taken 2-3 hours
(and I've had one take 4hrs…
) plus the follow-up after a few months
(after adapting to the fit, where you tweak the final details
).
It can't overstated how important the FITTER is, not the tools being used. There's always discussions on Retul, Guru fit
(which was purchased by Cannondale if memory serves me right
), Specialized Body Geometry fit, etc. etc. What it always comes down to is how well the fitter knows how to use these tools and how well he/she understands YOU.