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Data & Evidence

Original data analyses and evidence pages that back the claims made in our guides. Every number can be recalculated from the documented sample and method.

Last checked: 6 November 2026. Each figure on these pages can be recalculated from its documented sample and method.

Not sure which size or standard you need?

Our buying guides cover shackle lengths, lumen claims and valve types — the details the spec table never explains.

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