Bike Fit questions

Equipment
1

My

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question is where on saddle is the BB-saddle measured from on a Retul bike fit?
Is it straight up the seat tube to where it meets the top of saddle?

Have a general question about retul bike fits. I am tweaking my bike fit from 8 years ago. The Bike Fitter used retul system.

2

Use center of the saddle (measure your saddle length and then start at half of that) to the center of the BB. I’m trained on Retül and that’s how it was taught there.