Licenses
Licenses and credits
The published formulas and open-source parts this site uses, and their licenses.
Sources used on the site today
| What | From | Used for |
|---|---|---|
| Road frame and saddle-height formulas | Colorado Cyclist, Bike Fit Guide (read November 13, 2026) | C-T frame = 0.67 × inseam; C-C frame = 0.65 × inseam (LeMond / Guimard); saddle height = 0.883 × inseam. Reference only; our own wording, code and drawing |
| Why the maker’s chart decides | Sheldon Brown, Frame Sizing (read November 13, 2026) | Standover and top-tube notes in the “Check the maker’s chart” box |
Fonts
| What | From | License | Used for |
|---|---|---|---|
| DejaVu Sans | The DejaVu fonts project (dejavu-fonts.github.io) | Bitstream Vera Fonts License; DejaVu changes in the public domain | Lettering drawn into the share image and app icons (not served as a font) |
The DejaVu license allows the fonts to be used, copied and distributed freely, with its copyright and permission notice kept; the full text is in the DejaVu license.
Our own work
The pages, the bike drawing, the calculator code and the SportSizing mark are our own work. The pages use your device’s own system fonts and no third-party code. Scripts from outside this site: our self-hosted Umami counter, and Google Analytics only if you accept it (see privacy).
When a calculator uses a published formula or range, its source appears here and on the calculator’s page.