Advanced Vendetta V20c Fit | Cruzbike Recumbent Road Bikes

How does your fit and the position of the handlebars impact the V20C? This video discusses the impact of handlebar placement and arm position and how to get the most ideal fit for you.
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So here is a question or two: How do you determine your handlebar width? Do you simply follow the width of your shoulders rule? I see you have a flared "gravel" bar. Does that help?
Also, unrelated to fit, how wide a tire can the V20c accommodate?
Thank you.