Why so few guides?
Because the calculators already are the guides. "How do I find my saddle height", "what pressure should I run", "how do I calculate TSS" — each of those is a full article on the page that does the arithmetic, with tables computed from the same engine as the tool, so the explanation and the number can never disagree. Writing a second page on the same question would split the answer in two. A guide earns its place here only when there's no single number to compute: a reference chart of published values, a measuring method, a symptom that could be several things, or a setup decision.
What every guide promises
The same things every calculator does. Every figure names its source — a manufacturer's manual, a published study, a standards body — and the honest note stays in when it's inconvenient. Where a chart is worth having beside the bike, it prints on one page with no email and no signup. And each guide hands you to the tool that runs your numbers, because the chart tells you the rule and the calculator tells you your answer.