Thank you.As a guide, I go on the web page of Specialized Bikes as they have a nice calculation method to find out your size, relative to the bikes they manufacture. For example, my size is S3 so I will check the geometry measurements of their bikes in the size S3, and then compare those numbers to those of the bikes you plan on buying.
I also made myself a worksheet to easily compare many bikes side-by-side. Attached below.
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